Source Identification and Spatial Distribution of Heavy Metal Concentrations in Shallot Fields in Brebes Regency, Central Java, Indonesia

Table 1

Statistical analysis results of heavy metal concentrations in the soil of shallot fields in Brebes Regency, Central Java Province, Indonesia.

Variables	n	Mean	Min	Max	SD	CV	Skewness	Kurtosis	BGV	K-S test
		mg kg^−1				%			mg kg^−1
Pb	184	12.53	7.84	18.94	2.50	19.95	0.4	−0.45	27.0	0.058
Cd	184	1.78	0.99	2.31	0.27	15.00	−0.75	0.48	0.41	0.095
Co	184	6.33	3.02	9.98	2.17	34.34	0.06	−1.34	11.3	0.092
Ni	184	16.22	10.17	26.62	3.53	21.73	0.48	−0.35	29.0	0.073
Cr	184	21.52	10.40	49.55	7.42	34.50	1.33	1.86	59.5	0.117
pH	184	6.44	5.02	7.60	0.50	7.80	−0.27	-0.16	—	0.058
SOC^e	184	0.91	0.35	3.30	0.37	40.35	2.70	11.66	—	0.169
CEC^f	184	39.10	11.07	62.15	8.33	21.29	−0.15	0.39	—	0.061

SD, standard deviation; CV, coefficient of variation (%); BGV, background contents [27]; K-S, Kolmogorov–Smirnov test; SOC, soil organic carbon (%); CEC, cation exchange capacity (cmol(+) kg⁻¹).