Characteristics, Distribution, and Source Analysis of the Main Persistent Toxic Substances in Karst Groundwater at Jinan in North China

Table 7

Quality evaluation of general geochemical compounds in fractured karst water.

Evaluating compounds	I		II		III		IV		V
	Groundwater quality standard (mg/L)	Fraction of samples meeting the standard (%)	Groundwater quality standard (mg/L)	Fraction of samples meeting the standard (%)	Groundwater quality standard (mg/L)	Fraction of samples meeting the standard (%)	Groundwater quality standard (mg/L)	Fraction of samples meeting the standard (%)	Groundwater quality standard (mg/L)	Fraction of samples meeting the standard (%)
pH	pH 6.5 to 8.5	100	pH 6.5 to 8.5	0	pH 6.5 to 8.5	0	pH 5.5 to 6.5 or 8.5 to 9.0	0	pH <5.5 or >9.0	0
Fe	≤0.1	81.21	≤0.2	8.05	≤0.3	3.36	≤2.0	6.71	>2.0	0.67
Mn	≤0.05	97.99	≤0.05	0	≤0.10	2.01	≤1.50	0	>1.50	0
Zn	≤0.05	91.28	≤0.5	8.05	≤1.00	0	≤5.00	0.67	>5.00	0
Al	≤0.01	63.09	≤0.05	20.81	≤0.20	14.77	≤0.50	0.67	>0.5	0.67
Cl^-	≤50	69.8	≤150	28.86	≤250	1.34	≤350	0	>350	0
	≤50	15.44	≤150	69.8	≤250	11.41	≤350	3.36	>350	0
Total hardness	≤150	0	≤300	19.46	≤450	57.72	≤650	22.15	>650	0.67
TDS	≤300	12.08	≤500	56.38	≤1000	30.87	≤2000	0.67	>2000	0
DO	≤1.0	97.32	≤2.0	1.34	≤3.0	1.34	≤10.0	0	>10.0	0
NH4^+ (In N)	≤0.02	99.33	≤0.10	0	≤0.50	0.67	≤1.50	0	>1.50	0
Na^+	≤100	100	≤150	0	≤200	0	≤400	0	>400	0