黄河中卫段排水沟氟化物污染特征及影响因素OA

In the ecological protection of the Yellow River,analyzing the pollution status and spatiotemporal variation patterns of fluoride in drainage ditch water is of great significance for ensuring basin water security.This study collected representative water samples from drainage ditches in the Zhongwei section of the Yellow River across different hydrological periods,measured fluoride(F)concentrations and indicators such as pH,suspended solids,and turbidity(NTU),and evaluated the pollution level of fluoride using the single-factor index(Pi)and the Nemerow comprehensive pollution index(P').Spatial variation characteristics were further analyzed by combining classical statistics with geostatistical methods.The results showed that the average fluoride concentrations during the normal,wet,and dry seasons were 1.15,0.81,and 1.42 mg/L,respectively,indicating significant temporal variation,with the highest concentration observed in the dry season.High fluoride concentration areas across all three periods were concentrated in the northwestern edge of the study area.According to the single-factor evaluation,the proportions of sampling points where fluoride water quality was worse than Class V during the dry,wet,and normal seasons were 14.8%,4.2%,and 8.5%,respectively.The Nemerow pollution index evaluation indicated that the overall pollution level during the dry season was generally lower than during the normal and wet seasons,which was closely related to the significantly lower turbidity and suspended solids concentrations in the dry season.It could provide a basis for the scientific assessment of fluoride in drainage ditches of the Yellow River and offer data support for optimizing water quality monitoring planning in the Ningxia section of the Yellow River.