Table 2.

Contents of heavy metal elements in chilled pork samples from three different sources

Source	Pb (μg/kg)		As (μg/kg)		Hg (μg/kg)
	Mean±SD	Range	Mean±SD	Range	Mean±SD	Range
Wet market	22.82±20.48b	2.70–138.00	7.58±6.72a	ND–31.70	1.61±1.78a	ND–7.50
Supermarket	25.55±21.29b	7.00–102.20	14.05±8.24b	4.40–43.30	1.48±2.10a	ND–6.20
Online market	11.27±12.74a	0.10–80.60	11.49±4.91b	4.50–31.40	1.38±2.28a	ND–13.00
Limit	≤200		≤500		≤50
Source	Cd (μg/kg)		Cr (μg/kg)
	Mean±SD	Range	Mean±SD	Range
Wet market	0.21±0.31a	ND–2.25	46.16±57.17a	ND–335.90
Supermarket	0.18±0.19a	ND–0.69	72.01±31.78a	ND–130.40
Online market	0.47±0.39b	ND–1.85	77.82±58.27a	ND–182.20
Limit	≤100		≤1000

^{a, b} Means in the same line with different lowercase letters are significantly different (P<0.05) according to ANOVA and Duncan test. ND: not detected, <1.0 μg/kg for As, <1.0 μg/kg for Hg, <0.1 μg/kg for Cd, <10.0 μg/kg for Cr. The measurements of chilled pork samples were based on wet weight