Neglect of Temperature and pH Impact Leads to Underestimation of Seasonal Ecological Risk of Ammonia in Chinese Surface Freshwaters

Table 1

Sites with ammonia nitrogen ecological risk in summer and autumn of 2017.

Seasons	Basins	Sites	Seasonal average pH	Seasonal average temperature (°C)	Seasonal average ammonia concentration (mg/L)	Classification of water quality	WQC of ammonia (mg/L)	HQs
Summer (Jun.–Aug.)	HURB	Fuqiao brake, Luyi	8.60	29.2	0.16	II	0.14	1.14
	SWRs	Mirui, Linzhi	8.54	11.5	0.81	III	0.47	1.72
	Dianchi Lake	Luojiaying, Kunming	9.11	24.2	0.27	II	0.09	3.00
	Dianchi Lake	Dianchinan, Kunming	9.03	24.6	0.31	II	0.09	3.44
	Erhai Lake	Jinhe, Dali	8.64	24.6	0.26	II	0.17	1.53
Autumn (Sept.–Nov.)	SHRB	Songlin, Songyuan	8.57	11.8	0.73	III	0.44	1.66
	HURB	Aishanxi big bridge	8.58	19.2	0.29	II	0.27	1.07
	Dianchi Lake	Guanyinshan, Kunming	8.74	20.5	0.41	II	0.19	2.16
	Dianchi Lake	Luojiaying, Kunming	9.09	20.3	0.29	II	0.12	2.42
	Dianchi Lake	Dianchinan, Kunming	8.97	20.6	0.19	II	0.13	1.46