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 6

Selected heavy metal/metalloid contents in fertilizer samples collected from the selected CKDu endemic area.

Fertilizer type	Mean metal contents in fertilizers ± SD
	Cr (mg/kg)	Mn (mg/kg)	Fe (mg/kg)	Cu (mg/kg)	Zn (mg/kg)	As (mg/kg)	Cd (mg/kg)	Pb (mg/kg)
Urea	102 (±4.17)	2211 (±128.1)	2301 (±108.1)	21.3 (±1.1)	723 (±96.5)	59.9 (±2.72)	1.74 (±0.14)	289 (±9.78)
MOP (muriate of potash)	83.6 (±4.4)	4.20 (±0.75)	702 (±116.1)	0.58 (±0.17)	93.8 (±20.4)	ND	ND	6.34 (±1.64)
TSP (triple superphosphate)	386 (±44.8)	4234 (±55.8)	2642 (±466)	141 (±15.9)	348 (±21.9)	ND	ND	124 (±14.5)

ND: not detected.