有机磷灭蚊剂投放浓度和时间对水体总磷的影响

Effect on adding concentration and time of organophosphorus insecticide on TP in water

为分析新型低毒有机磷杀虫剂"1%双硫磷颗粒"投放对河道水质的影响,设置不同药剂投放浓度和不同反应时间的室内试验,以TP、NH_(3)-N及S^(2-)为目标因子,分析该药剂投放后水体污染物浓度。结果表明:不同试验组水样中S^(2-)质量浓度均小于0.02 mg/L,NH_(3)-N质量浓度处于0.029~0.036 mg/L之间,均达到地表水Ⅰ类标准;不同浓度药剂投放1 h后,水体TP质量浓度已达到稳定状态,且在60 h内均保持稳定,药剂投加量与水体TP质量浓度呈显著正相关(R^(2)=0.85);不同处理组的药剂在水体中的TP释放量无明显差异,均在1.06~1.30 mg/g之间。"1%双硫磷颗粒"推荐适宜投放量不会使河道水质恶化到劣Ⅴ类,但增加药剂投放量会增加水体TP污染及富营养化风险。

In order to analyze the impact of new low toxic organophosphorus insecticide "1% Abate Granules" on river water quality, indoor experiments with different adding concentrations and reaction time were set up. TP, NH_(3)-N and S^(2-) were taken as target factors to analyze the concentration of water pollutants after the application of the insecticide. The results showed that in the water samples of different test groups the mass concentration of S^(2-) was lower than 0.02 mg/L, the mass concentration of NH_(3)-N was between 0.029 mg/L and 0.036 mg/L, which reached the class I standard of surface water. After 1 h of adding different concentrations of insecticide, ρ(TP) of water has reached a stable state and remained stable within 60 hours. Insecticide dosage and ρ(TP) of water was significantly positive correlation(R^(2)=0.85). There was no significant difference in TP release between different treatment groups, which ranged from 1.06 mg/g to 1.30 mg/g. The recommended appropriate dosage of "1% Abate Granules" will not worsen the river water quality to inferior class V, but increasing the dosage will increase the risk of TP pollution and eutrophication.