Risk Assessment of Trace Element Contamination in Drinking Water and Agricultural Soil: A Study in Selected Chronic Kidney Disease of Unknown Etiology (CKDu) Endemic Areas in Sri Lanka

Table 5

Correlation matrix of phosphate and heavy metal concentrations of soil in paddy grown agricultural areas in selected sampling areas.

	[ ]	[Cd]	[Cr]	[As]	[Pb]	[Cu]	[Zn]	[Fe]	[Mn]
[]	—	0.361	0.712	0.28	−0.245	0.061	0.171	0.147	−0.04
[Cd]	0.361	—	0.473	−0.197	0.576	0.250	0.212	−0.165	−0.337
[Cr]	0.712	0.473	—	−0.070	0.216	0.064	−0.074	−0.062	−0.112
[As]	0.28	−0.197	−0.070	—	0.047	0.219	−0.089	−0.050	−0.202
[Pb]	−0.245	0.576	0.216	0.047	—	0.052	0.103	0.032	0.120
[Cu]	0.061	0.250	0.064	0.219	0.052	—	0.016	0.213	0.020
[Zn]	0.171	0.212	−0.074	−0.089	0.103	0.016	—	0.301	−0.120
[Fe]	0.147	−0.165	−0.062	−0.050	0.032	0.213	0.301	—	0.045
[Mn]	−0.040	−0.337	−0.112	−0.202	0.120	0.020	−0.120	0.045	—

Correlation is significant at the 0.05 level (2-tailed). Correlation is significant at the 0.01 level (2-tailed).