Cell-type specificity of lung cancer associated with low-dose soil heavy metal contamination in Taiwan: An ecological study

Table 1 Township’s heavy metals contamination in soil during 1982-1986 ^a

Heavy metals	1982-1986 (TownshipN = 283)			TEPA guidelines		NYSDEC guidelines
	Q1	Median	Q3	Normal land-use	Agriculture land-use	Unrestricted use	Residential use
As (mg/kg)	3.18	6.08	7.70	60	-	0.11	0.21
Cd (mg/kg)	0.03	0.08	0.15	20	5	0.43	0.86
Cr (mg/kg)^c	< 0.01	0.27	1.23	250	-	29	58
Cu (mg/kg)	3.76	5.98	9.67	400	200	270	270
Pb (mg/kg)	6.25	8.09	11.06	2000	500	200	400
Hg (mg/kg)	0.09	0.15	0.23	20	5	-	-
Ni (mg/kg)	1.22	2.07	3.29	200	-	72	140
Zn (mg/kg)	7.35	10.17	14.12	2000	600	1100	2200

^a AS, arsenic; Cd, cadmium; Cr, chromium; Cu, copper; Hg, mercury; Ni, nickel; NYSDEC, New York State Department of Environmental Conservation; Pb, lead; TEPA, Taiwan Environmental Protection Agency; Zn, zinc.
^cChromium NYSDEC guidelines value is the sum of the hexavalent and trivalent forms.

ISSN: 1471-2458