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Table 1

Results of routine analysis of water samples in the Xinhe River (mg/L)

Sampling point	pH	COD	NH₃-N	TP	F⁻	Cl⁻	Pb	Cd	Cr⁶⁺
Headwaters of Xinhe River	6.5	25	4	0.2		226.7	0.06	0.002	0.003
Estuary of Puji River	7.4	196	11	0.4	0.816	128	0.085	0.006	0.02
Estuary of Qunying River	7.3	152	11.4	3.5	0.485	480	0.051	0.003	0.01
Estuary of Wengjianhe River	7.7	145	10.1	2.4	0.756	345	0.076	0.008	0.02
Estuary of Xinhe River	7.1	205	22	3.1		14.1	0.11	0.009	0.095
Standard (Class V)^a	6–9	40	2.0	0.4	1.5	250	0.1	0.01	0.1

Sampling point	pH	COD	NH₃-N	TP	F⁻	Cl⁻	Pb	Cd	Cr⁶⁺
Headwaters of Xinhe River	6.5	25	4	0.2		226.7	0.06	0.002	0.003
Estuary of Puji River	7.4	196	11	0.4	0.816	128	0.085	0.006	0.02
Estuary of Qunying River	7.3	152	11.4	3.5	0.485	480	0.051	0.003	0.01
Estuary of Wengjianhe River	7.7	145	10.1	2.4	0.756	345	0.076	0.008	0.02
Estuary of Xinhe River	7.1	205	22	3.1		14.1	0.11	0.009	0.095
Standard (Class V)^a	6–9	40	2.0	0.4	1.5	250	0.1	0.01	0.1

^aThe State Standard of the People's Republic of China: Environmental quality standards for surface water (GB 3838-2002). Class V: water is suitable mainly for agricultural areas and areas with general landscape requirements.

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