Influence of the interaction of calcium carbonate particles with surfactants on the degree of water pollution in small rivers

Ecological Processes

Table 1 Indicators of water quality of the Nistru and Bic Rivers at their confluence

Indic./sample	Nistru River, upstream to the confluence of the Bic River	Bic River, upstream to the confluence of the Nistru River	Nistru River, 200 m downstream of the confluence with the Bic River
pH	8.18	7.62	7.71
[NH₄ ⁺], mg/L	0.257	51.0	42.3
[NO₂ ⁻], mg/L	0.156	0.253	0.242
[NO₃ ⁻], mg/L	5.6	0	0
Oxygen, mgO/L	8.71	0	0
CBO₅, mgO/L	0.67	97.8	93.4
CCO_Cr, mgO/L	17.0	150	144