Trace and Essential Elements Analysis in Cymbopogon citratus (DC.) Stapf Samples by Graphite Furnace-Atomic Absorption Spectroscopy and Its Health Concern

Table 4

Tolerable daily intake of heavy metals in ingested products.

Metal	Accepted standards of heavy metal toxicity for ingested products
	California Standards^# (CS)	USP^##	FDA^###	Experimental results (mean ± SEM^a)
Arsenic	10.0 μg	3.0 ppm	—	0.070 ± 0.012
Cadmium	4.1 μg	3.0 ppm	—	0.024 ± 0.004
Lead	0.5 μg	10.0 ppm	75.0 μg	0.019 ± 0.006

 ^aSEM = standard error mean; ^#California Proposition Daily Limits for Heavy Metal Consumption, http://www.oehha.ca.gov/prop65/p65faq.html; ^##United States Pharmacopeia (USP) Limit for Nutritional Supplements, USP (http://www.usp.org/); ^###FDA Tolerable Daily Diet Lead Intake (http://www.fda.gov/).