Journal of Analytical Science and Technology

Table 3 Correlation coefficients ( r **)* matrix for heavy metals in acid extract of sediments during summer and winter**

From: Occurrence, risk assessment, and source apportionment of heavy metals in surface sediments from Khanpur Lake, Pakistan

	Cd	Cr	Cu	Fe	Mn	Pb	Zn
Cd	1	0.580	0.389	−0.029	0.473	0.181	0.223
Cr	0.320	1	0.657	0.087	0.319	0.412	0.345
Cu	0.171	0.153	1	0.143	0.685	0.480	0.803
Fe	0.071	−0.056	0.615	1	0.126	0.151	−0.016
Mn	0.086	−0.031	0.863	0.551	1	0.425	0.619
Pb	0.362	0.432	−0.068	−0.187	−0.087	1	0.427
Zn	0.103	0.540	−0.028	−0.208	−0.245	0.062	1

Values for summer are below the diagonal, and those for winter are above the diagonal. *r values >0.330 or <−0.330 are significant at p < 0.01.

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