Journal of Food Quality / 2017 / Article / Tab 3

Research Article

Effect of Salinity Intrusion on Food Crops, Livestock, and Fish Species at Kalapara Coastal Belt in Bangladesh

Table 3

Description of quality control (QC) for the determination of salinity indicators in water samples across the Kalapara coastal belt in Bangladesh.

Salinity indicators in waterContainer Volume (ml)Sampling and transportPreservationMaximum holding timeStorageRemarks

Salinity %Polyethylene plastic bottle500 mlFilled bottle to exclude airDetermined on the sampling locationsAnalyzed immediatelyThe meter was calibrated on the day of use

Conductivity (µS/cm)Polyethylene plastic bottle500 mlFilled bottle to exclude airDetermined on the sampling locationsAnalyzed immediatelyThe meter was calibrated on the day of use

TDS, mg/lPolyethylene plastic bottle500 mlTransported under ice and filled container to exclude airHeld for 7 days before analysisStored in refrigerator at 4°CTotal dissolved solids (TDS) also known as “filterable residues”

pHPolyethylene plastic bottle100 mlFilled bottle to exclude airDetermined on the sampling locationsThere was no storage in refrigeratorThe meter was calibrated on the day of use

Fluoride (F), mg/lPolyethylene plastic bottle500 mlNot maintained7 days

Chloride (Cl), mg/lPolyethylene plastic bottle500 mlTransported under ice and filled container to exclude airAnalyzed on that dayStored in ice box at 4°C

Nitrite (), mg/lPolyethylene plastic bottle200 mlTransported under ice2 daysStored in refrigerator at 4°C

Bromide (Br), mg/lPolyethylene plastic bottle500 mlTransported under iceAnalyzed within 7 daysStored in refrigerator at 4°C

Nitrate (), mg/lPolyethylene plastic bottle500 mlTransported under iceAcidified with HCl to pH < 27 days with acidificationStored in refrigerator at 4°C

Phosphate (), mg/lPolyethylene plastic bottle300 mlFilled bottle to exclude air. Filtered on site (0.45 μm cellulose acetate membrane filter). Transported under ice2 daysFreezed (−20°C) after filtration

Sulfate (), mg/lPolyethylene plastic bottle100 mlFilled bottle to exclude air. Transported under ice7 daysStored in refrigerator at 4°C

Sodium (Na+), mg/lPolyethylene plastic bottle 500 mlFilled container completely to exclude air. Transported under iceAcidified with nitric acid to pH < 2Analyzed within 1 monthStored in refrigerator at 4°CAcidified for the determination of other metals in the sample

Potassium (K+), mg/lPolyethylene plastic bottle 500 mlFilled container completely to exclude air. Transported under iceAcidified with nitric acid to pH < 2Analyzed within 1 monthStored in refrigerator at 4°CAcidified for the determination of other metals in the sample

Calcium (Ca2+), mg/lPolyethylene plastic bottle 500 mlFilled container completely to exclude air. Transported under iceAcidified with nitric acid to pH < 2Analyzed within 1 monthStored in refrigerator at 4°CAcidified for the determination of other metals in the sample

Magnesium (Mg2+), mg/lPolyethylene plastic bottle 500 mlFilled container completely to exclude air. Transported under iceAcidified with nitric acid to pH < 2Analyzed within 1 monthStored in refrigerator at 4°CAcidified