Table 2. The physicochemical parameters measured in Lake Chitu

Study area	NH3-N mg/L	Alkalinity meq/L	CO32– mg/L	HCO3– mg/L	SO42– mg/L	NO3– mg/L	NO2– mg/L	F− mg/L	PO43− mg/L	Hg µg/L	As µg/L
FA	1.12 ± 0.021	57,324 ± 1.73a	318,243 ± 3.2a	5,226.5 ± 1.04a	60.2 ± 0.012a	7.47 ± 0.25a	0.83 ± 0.01	300 ± 1.15a	0.1 ± 0.012	0.23 ± 0.021a	11.1 ± 0.01a
PA	1.12 ± 0.020	47,736 ± 29.31b	4,774 ± 3.61b	ND	60.7 ± 0.012b	10.01 ± 0.02b	0.79 ± 0.03	380 ± 1.15b	0.1 ± 0.016	0.32 ± 0.012b	11.3 ± 0.03b
AA	1.12 ± 0.021	56,100 ± 7.51a	56,100 ± 8.1a	2,239.92 ± 0.72a	67.03 ± 0.56a	9.9 ± 0.2a	0.8 ± 0.01	450 ± 1.73a	0.10 ± 0.021	0.20 ± 0.01	11.5 ± 0.02a

Values with different letters within a column are significantly different at p < 0.05 level (Tukey HSD test).
FA, flooding area; PA, protected area; AA, anthropogenic areas; ND, not detected.