Environmental surveillance of commonly-grown vegetables for investigating potential lead and chromium contamination intensification in Bangladesh

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Table 2 Overall statistics of the data for the metals across all vegetables

Heavy metal	Total count of samples analyzed	Contamination found in samples			Samples with safe levels			Samples yielding ND			Median, µg/g dry weight basis	Upper Quartile, µg/g dry weight basis
Heavy metal	Total count of samples analyzed	Total count	% of total count of analyzed samples	Maximum level occurred	Total count	% of total count of analyzed samples	Minimum level detected, dry weight basis	Total count	% of total count of analyzed samples	% of total sample count with safe levels	Median, µg/g dry weight basis	Upper Quartile, µg/g dry weight basis
Pb	285	84	29.47	48.43 µg/g dry weight basis	201	70.53	0.002 µg/g	192	67.37	95.52	7.601	15.237
Cr	290	2	0.69	305.991 µg in standard 50 g FW	288	99.31	–	245	84.48	85.07	1.637	4.614
Cd	286	51	17.83	5.484 µg/g dry weight basis	235	82.17	0.049 µg/g	150	52.48	63.83	0.67	1.2678

ND not detected (at ppb level for 0.2 g dry sample digested into 100 ml volume), FW fresh weight