Accumulation of Heavy Metals in Rice (<i>Oryza sativa</i>. L) Grains Cultivated in Three Major Industrial Areas of Bangladesh

Hasan, G. M. M. Anwarul; Das, Anuj Kumer; Satter, Mohammed A.

doi:https://doi.org/10.1155/2022/1836597

Journal of Environmental and Public Health

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Abstract Introduction Methods and Materials Results and Discussion Conclusion Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2022 | Article ID 1836597 | https://doi.org/10.1155/2022/1836597

Accumulation of Heavy Metals in Rice (Oryza sativa. L) Grains Cultivated in Three Major Industrial Areas of Bangladesh

G. M. M. Anwarul Hasan,¹Anuj Kumer Das,²and Mohammed A. Satter¹

Academic Editor: Orish Ebere Orisakwe

Received23 Nov 2021

Revised05 Jan 2022

Accepted07 Feb 2022

Published08 Mar 2022

Abstract

Human exposure to nonessential trace elements occurs from food crops that are contaminated by the soil. The present study aimed to determine the level of heavy metals in soil and rice samples using an atomic absorption spectrophotometer from three major industrial areas in Bangladesh: Savar, Gazipur, and Ashulia. Heavy metals were detected in the order Fe > Zn > Ni > Cr > Pb > Co > Cu > Cd > As and Zn > Cu > Cr > Co > Fe > Cd > Pb > Ni > As in the soil and rice samples, respectively. From this analysis, it was observed that the detected concentrations of Zn, Cd, Cr, and Co were higher than the WHO/FAO recommended maximum tolerance values. The transfer factor of the detected heavy metals from soil to rice was detected in the following order: Zn > Cu > Cr > Co > Cd > Pb > Fe > As > Ni. The accumulation of heavy metals in rice is a major public health concern. Therefore, we recommend strict regulations for the safety of food crops grown in the study areas.

1. Introduction

Heavy metals are toxic because they are persistent environmental pollutants [1, 2]. One major concern regarding heavy metals is that they are neither destroyed nor degraded, although their chemical forms may change. Heavy metal-mediated environmental contamination has become a global issue in recent years because of extensive industrialization worldwide [3]. Metal contamination in soil is the easiest way to expose humans to metals [2]. These heavy metals can accumulate in human tissues through the consumption of fruits, crops, and vegetables grown in contaminated soil [2, 3] and cause serious health risks [4]. Heavy metal accumulation in crops depends on several factors, including the type of plant, soil characteristics, selectivity to the crops, and permissibility of the metals [1, 3]. The term “accumulation factor” is used to indicate the heavy metal concentration in soil with respect to plants [5–8].

Exposure to metals through the digestion of contaminated food crops is a public concern because of the presence of heavy metals in the soils in industrial areas. Dietary intake is possibly the most important human exposure method, but inhalation is another exposure medium [4, 9]. Long-term exposure to heavy metals can cause serious health problems even when ingested at trace levels [9].

Essential metals, such as Cu and Zn, can bioaccumulate in animal and human bodies and may cause serious health problems when they reach their excessive limit [9, 10]. Several essential nutrients are removed from the human body after consumption of contaminated foods, which causes serious health issues [4]. Contamination of crops with heavy metals is a serious global issue [11]. In Bangladesh, industrialization is rapidly expanding; hence, environmental pollution is increasing [4]. Therefore, health risk assessment, calculated as the daily dietary intake of heavy metals from contaminated foods, is very important for both people.

There are many sources of heavy metal contaminations [12]. Several necessary nutrients, such as N, P, and K, are acquired by plants from the soil; unnecessary toxic metals can also be gathered from the soil as some plants can accumulate high heavy metal concentrations [13]. Heavy metals can be transferred from soil to crops through roots or shoots [14]. Toxic metals such as Pb, Cd, and As are transferred from the soil and stored in cereal grains [15]. The transfer capability of heavy metals from soil to crops affects their bioaccumulation pattern [16].

Rice plays an important role in the human diet [17], especially in Bangladesh. Rice provides vitamins, minerals, and amino acids to consumers worldwide [18]. The 2016 BBS reports [19] that approximately 80 different varieties of rice are cultivated in Bangladesh in three different seasons, and approximately 34.7 million metric tons of rice are produced per year. Approximately, 80% of Bangladeshi people consume rice three times a day [20]. Currently, the presence of toxic metals in arable lands and their transfer to crops, such as rice, are major concerns [21]. Crops grown in contaminated soil can accumulate large amounts of heavy metals in their tissues [22–24]. In Bangladesh, the accumulation of toxic metals in crops such as rice is a major concern [25]. The use of industrial wastes, agricultural chemicals, wastes from ship-breaking industries, and mining are the main sources of toxic metal contamination in the surrounding environment [26–29]. The presence of several toxic metals, such as Cd, Cu, Pb, and Hg in rice is a matter of great concern [30]. Three different studies showed an average lead content of 0.69 mg/kg in rice in southeast China [31], Cd content with maximum concentration of 0.467 mg/kg [21], and Pb content of 0.957 mg/kg [32]. These studies support the possibility of contamination of rice plants and grains by heavy metals. As rice, which is mostly contaminated by heavy metals, is the major food crop consumed in Bangladesh, there are possible carcinogenic and noncarcinogenic health risks.

The study area includes many textile, garment, tannery, pharmaceutical, and food industries. The major effluents from these industries are suspended solid; biological oxygen demand (BOD); chemical oxygen demand (COD); synthetic dyes; toxic chemicals; sulfur; alkalis; hydrogen peroxide; toxic heavy metals, including Cu, Cr, Cd, Zn, Ni, As, and Pb; dissolved oxygen; oil; grease; fats; sugar; color; preservatives; sulfides; ammonium salts; calcium salts; and nutrients, such as nitrogen, ammonia, and phosphates [33–36]. A large portion of these effluents is discharged directly into water streams that contaminate soil and crops. To date, no study has been conducted to detect the transfer of heavy metals into field crops in industrial areas, such as Savar, Gazipur, and Ashulia as the local inhabitants are regularly growing crops and consuming them. By detecting the metal contents present in crops in relation to soil, it is possible to assess the potential human health risks after their consumption.

The present study aimed to detect metal contamination levels in the soils of three major industrial areas of Bangladesh and to determine the metal concentrations, due to industrial activities, in food crops grown in those areas. Rice was the study’s model crop because of its staple food status in Bangladesh. The findings of this study may provide insights into the metal accumulation factor of field crops from the soil and potential human health risks through the consumption of crops contaminated with heavy metals.

2. Methods and Materials

2.1. The Study Area

Soil and rice samples were collected from three main industrial areas in Bangladesh, Savar, Ashulia, and Gazipur. Savar is an Upazila of the Dhaka district that is located approximately 24 km northwest of Dhaka city. Savar is situated at 23°51′30″N 90°16′00″E/23.8583°N 90.2667°E/23.8583; 90.2667 with a total area of 280.13 km². Savar is situated on the bank of the Banshi River. River water is used for drinking, bathing, and irrigation. However, because of industrialization and the huge dumping of industrial waste, the river water has become heavily polluted. Ashulia is a thana under Savar Upazila that is situated on the left bank of the Turag River. Ashulia is situated at 23° 53′ 59.1936″ N/90° 19′ 23.0952″ E, covering a total area of 27.186 km². The Gazipur District is part of the Dhaka Division situated at 23° 59′ 59.7876″ 90° 25′ 12.9828″ E. The total area of Gazipur is approximately 1741.53 km².

2.2. Sample Collection and Preparation for Heavy Metal Analysis

In each study area, soil samples were collected from several locations in the rice fields. At least three replicates of each sample were collected, leveled, and stored properly for further analysis. After collection, the soil samples were dried (50°C for 24 h), measured, ground to small powder using a mortar and pestle, and stored in a glass bottle for further analysis. The rice samples were collected, using the same sampling pattern, from the same field where the soil samples were collected. For rice sampling, a high-yielding rice variety from Bangladesh (BRRI Dhan 28) was collected. Samples were collected by hand, and cross-contamination was avoided. The samples were collected from at least ten locations in each sampling site between April and August 2021. Afterwards, they were dried at 70–80°C until a constant weight was reached [37].

2.3. Determination of Heavy Metal Concentrations in Soil and Rice Samples

The concentrations of heavy metals were detected in both soil and rice using an atomic absorption spectrophotometer (iCE-3000 series, Thermo Scientific, USA). An air-acetylene flame was used to ensure maximum sensitivity during the instrument operation. About 0.3 g of ground soil and rice grains were digested using a microwave digestion system (Berghof Speedwave, Germany) with 5 ml of 70% HNO₃ and 2 ml of 30% H₂O_2. After digestion, Milli-Q water was added to the digested samples to make a final volume of 25 mL. The chemicals used for this analysis were of analytical grade and purchased from Merck (Germany). All the digested samples were then filtered using a 0.45 µm filter syringe. Before analysis, all the consumables were soaked in diluted HNO₃ for 24 h and finally rinsed with distilled water.

The limits of detection for Fe, Cu, Zn, Cd, Pb, Cr, Co, Ni, and As were 0.9, 0.8, 0.6, 0.07, 0.10, 0.8, 0.07, 0.8, and 0.09 ng/l, respectively. Certified reference materials (Sigma Aldrich, USA) were used to ensure the good precision of the applied method.

2.4. Analysis of Transfer Factor of Heavy Metals

The ability of plants to transfer metals from the soil can be determined through transfer factor analysis. The following formula was used for this analysis:Here, C_plant and C_soil represent the total metal concentration in the plant part (mg/kg) and soil (mg/kg) on a dry-weight basis, respectively [38].

2.5. Statistical Analysis

Analyses and extractions were performed in triplicate. Statistical analysis was performed using the Statistics 10 software.

3. Results and Discussion

3.1. Traces of Heavy Metals Detected in Soil Samples

The results of the detected heavy metals in the soil and rice samples from three different industrial areas are presented in Tables 1 and 2, respectively. The average Fe concentrations were 873.61 ± 112.09 mg/kg, 668.34 ± 98.06 mg/kg, and 976.12 ± 32.45 mg/kg in the soil samples of Savar, Gazipur, and Ashulia, respectively. Higher Fe concentrations were detected in the soil samples from Ashulia, followed by those of Savar and Gazipur. The average Cu contents were 31.54 ± 7.23 mg/kg, 19.76 ± 5.97 mg/kg, and 29.65 ± 7.34mg/kg in the soil samples of Savar, Gazipur, and Ashulia, respectively. The Cu concentrations of most soil samples (47%) were within the range of the average shale value (45 mg/kg), indicating contamination at the sampling sites. The Cu concentrations detected in the sampling areas were similar to those of a previous study [39]. The present study indicated that the Cu concentrations were lower compared to those of other industrial cities in the world [40].

The detected heavy metals indicated contamination due to human activities in the industrial areas. Toxic metals from wastewater are mixed with soil and finally transferred to crops, resulting in serious health threats for both humans and animals. The average Zn values were 78.65 ±10.54 mg/kg, 64.98 ± 11.89 mg/kg, and 81.90 ± 12.87 mg/kg in the soils of Savar, Gazipur, and Ashulia, respectively. The comparative heavy metal concentrations in soil and rice are presented in Figure 1. This study reported that approximately 68% of the soil samples contained higher Zn values than the average shale value (0.095 mg/kg). The Zn concentrations in the soil samples of the study areas were higher than those in other major industrial cities of the world [40]. A study reported that the Zn concentrations in river alluvium soils were 78.50 mg/kg and 66.4 mg/kg, respectively [41]. Other heavy metals, including Cd, Pb, Cr, Co, and Ni, were detected in the soil samples from Savar, Gazipur, and Ashulia. The following were detected: Cd (11.08 ± 4.98 mg/kg–18.56 ± 6.75 mg/kg), Pb (34.09 ± 7.90 mg/kg–42.78 ±8.54 mg/kg), Cr (34.87 ± 8.74 mg/kg–46.93 ± 7.54 mg/kg), Co (19.56 ± 3.54 mg/kg–43.09 ± 8.69 mg/kg), Ni (43.25 ±12.53 mg/kg–51.76 ± 10.65 mg/kg), and As in small concentration (2.98 ± 1.12 mg/kg–3.76 ± 1.54 mg/kg).

(a)

(b)

(c)

The average Fe concentrations in rice samples were 14.89 ± 3.45 mg/kg, 9.49 ± 2.34 mg/kg, and 11.87 ± 3.34 mg/kg in Savar, Gazipur, and Ashulia, respectively. Similarly, the average Cu concentrations were 38.12 ± 11.21 mg/kg, 25.34 ± 8.56 mg/kg, and 19.74 ± 5.87 mg/kg, and average Zn concentrations were 121.76 ± 13.98 mg/kg, 107.43 ±18.54 mg/kg, and 97.34 ± 10.73 mg/kg in the soil samples of Savar, Gazipur, and Ashulia, respectively. Other heavy metals, including Cd, Pb, Cr, Co, Ni, and As, were also detected in the soil samples. The following were detected: Cd (0.98 ± 0.32 mg/kg–1.61 ± 0.79 mg/kg), Pb (ND–1.32 mg/kg), Cr (11.54 ± 4.09–23.67 ± 9.95 mg/kg), Co (8.54 ± 3.32–18.11 ± 5.09 mg/kg), Ni (ND–0.18 mg/kg), and As (0.031 ± 0.01–0.075 ± 0.03 mg/kg) in the crop samples of Savar, Gazipur, and Ashulia, respectively.

3.2. Transfer Factor (TF) of Toxic Metals from Soil to Rice

The transfer factor (TF) is defined as the capability of plants to absorb ionic metals through their roots to aerial parts [42]. The presence of heavy metals in plant tissues in relation to the soil’s heavy metal concentrations can be determined using transfer factor analysis. The TF is an important term for determining the transfer efficiency of heavy metals. Metals with high TF are easily transferred to crops unlike metals with low TF. The TFs of heavy metals from the soil to crops are presented in Table 3. Variances in heavy metal content may depend on their concentrations in soil and plant parts [43]. The present study showed that higher amounts of Cu and Zn were transferred from the soil to rice than other metals. The average TF values of Cu were 1.21, 1.28, and 0.67, whereas the average TF values of Zn were 1.55, 1.65, and 1.19 in Gazipur and Ashulia, respectively. Ni, As, and Pb showed lower TF values than the other heavy metals. The average TF values of Ni were 0, 0.003, and 0; the average TF values of As were 0.02, 0.01, and 0.01; and the average TF values of Pb were 0.03, 0, and 0.03 for rice samples of Savar, Gazipur, and Ashulia, respectively. The comparative transfer factors of Savar, Gazipur, and Ashulia are shown in Figure 2.

The ability of Ni, As, and Pb to form stable complexes with amino acids [44] may be the reason for their low TFs. Other factors, such as soil pH and soil properties, also influence metal TFs from soil to crops [45, 46].

The Savar, Gazipur, and Ashulia regions are at high risk because of environmental pollution due to rapid industrialization, huge population, and urbanization in the last 20 years. This study investigated the levels of selected heavy metals in soil and rice from the agricultural lands of the Savar, Gazipur, and Ashulia industrial areas. The study aimed to focus on the contamination status of soil and rice and to identify the interactions between soil and rice metal concentrations. Although Savar, Gazipur, and Ashulia are industrial areas, farmers produce different crops throughout the year and supply them locally and nationwide. Soil contamination with heavy metals results in crop contamination, which is a major health issue.

Because of rapid industrialization nationwide, soil, air, and water are becoming increasingly polluted because of the inadequate disposal of waste materials to the environment. Crops are also becoming increasingly polluted as a result of soil pollution. Savar, Gazipur, and Ashulia are three major industrial areas of the Dhaka Division, and significant amounts of heavy metals are discharged into the soil, which is finally transferred to crops and accumulated in edible grains. Heavy metals have been detected at high concentrations in crops grown in industrial areas of Bangladesh [2–4, 8].

Heavy metal pollution is one of the biggest problems of not only developing countries, such as Bangladesh, but also worldwide [3]. The effect of wastewater on crops has led to a change in the soil physiochemical nature (such as pH), which has a significant influence on heavy metal mobility and bioavailability in crops [47]. Continuous wastewater irrigation results in elevated levels of heavy metals in soil and food crops. In general, the transfer of heavy metals from the soil to plants is a key component of human exposure to these metals [48]. Rice is a staple food in Bangladesh and an important component of the human diet. The intake of heavy metal-contaminated rice causes several health problems, such as DNA damage, that may reduce energy levels. At the molecular level, heavy metals interact with the thiol, amino, and imino groups of proteins to form metal complexes, thus inhibiting protein activities [49]. Humans encounter heavy metals through the intake of contaminated foods, polluted air inhalation, or exposure in their daily lives [50]. The transfer route is from industry to the environment (soil and water), foods (crops and vegetables), and finally humans [51]. Heavy metals such as Pb, Cd, Mn, and As can enter the body through the mouth and gastrointestinal system during food ingestion, while other heavy metals can enter the body through inhalation. Lead can be absorbed through the skin.

Several human health effects can be observed owing to heavy metal toxicity. The functions of the brain, kidneys, lungs, liver, and blood can be altered by heavy metal toxicity [52]. Several heavy metals, including Fe, Cu, Cr, Co, and As, generate free radicals and induce oxidative stress and oxidation of biological molecules [53]. Certain heavy metals, such as Pb, Hg, Ni, Cd, and Fe, have carcinogenic effects. Heavy metals can target signaling and cellular regulatory proteins that are responsible for apoptosis, regulation of the cell cycle, DNA repair, DNA methylation, and cell growth and differentiation [54]. Heavy metals such as Pb and Mn can also induce neurotoxicity [55]. Heavy metals can also affect several plant functions, including nitrogen fixation, chlorosis, and plant growth and metabolism [49]. Several minerals, nutrients, and organic and inorganic matter are stored in the soil [3, 49]. Soil is polluted by heavy metals through natural, industrial, and human activities [4, 56–59]. Heavy metal exposure through food may cause serious health problems, including various fetal diseases.

In Bangladesh, several studies have been performed to detect heavy metal content in soil [3, 40, 60–62] and crops [41, 63–66]. A study reported that the concentrations of heavy metals, such as Cu and Pb, are higher than the permissible values in Zirani and Savar [67]. Similarly, another study detected higher concentrations of heavy metals such as Mn, Zn, Fe, and Cu than the standard regulatory limit in Dhaka [68]. In Khulna, the soil is contaminated with Pb and Cd [69]. Another study reported that the soil of Bogura city was contaminated with Cu and Cd [70]. The toxicity of heavy metals begins when they accumulate in soft tissues after ingestion [71]. When heavy metals are regularly taken above the acceptable daily limit through food, they become harmful to human health. The harmful effects of Cd, Pb, As, Zn, and Cu have also been reported [72]. Low Pb concentrations may lead to developmental defects in children [73], whereas high levels (75 μg/dL) may lead to coma and even death. Cd is considered a neurotoxicant in several animal models [74]. Ni is responsible for several disorders, including chronic bronchitis, emphysema, impaired pulmonary function, and fibrosis [75]. Excessive intake of Cu and Cr may be toxic [76]; although Cr helps to maintain the blood glucose level, Cr is used as a medication for diabetes [77].

In the present study, heavy metals such as Fe, Cu, Zn, Cr, Co, Ni, Pb, Cd, and As were detected in the soil samples, whereas higher amounts of Cu, Zn, Fe, Cr, and Co were detected in rice. From the analysis, it was observed that the concentrations of Zn, Cd, Cr, and Co were higher than the WHO/FAO recommended maximum tolerance values [78]. Therefore, the consumption of rice grown in these industrial areas is a major concern and regular monitoring is strongly recommended.

4. Conclusion

The results of this study revealed the presence of Fe, Zn, Cu, Pb, Cr, and Co, Ni, and As in soil and rice samples from three major industrial areas of the Dhaka division in Bangladesh. The average concentrations of Fe, Cu, and Zn were higher than those of Pb, Cr, Co, Ni, and As, indicating that the former are the major contaminants in these industrial areas. Food consumption is one of the major routes of exposure to heavy metals in humans. The possible transfer rate of these toxic heavy metals from contaminated soil to rice is also reported in the present study. The presence of hazardous heavy metals in food crops, such as rice, may lead to serious health problems. This study was based on selected spots of major industrial areas, and the background values of different heavy metals were different; therefore, the presence of their contents in the environment does not represent the proper pollution level in a particular area. However, environmental protection laws should be properly maintained to reduce environmental pollution, and more attention should be paid to minimizing contamination in the studied areas.

Data Availability

All the data used in this manuscript are available from the corresponding author upon request.

Conflicts of Interest

The authors declare no conflicts of interest.

Acknowledgments

The authors would like to thank the Institute of Food Science and Technology, BCSIR, Dhaka, Bangladesh, for their continuous support during the study. The study was supported by the ADP project allocated by the Ministry of Science of Technology (MOST), Bangladesh Government as part of the research work.

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