珠江水质和含氮消毒副产物的时空变化

研究区域是珠江广东省段的3条干流(西江、北江、东江)及交汇处(广州),目标是研究分析2年内29个采样点的常规水质指标的时空变化及溶解性有机氮(dissolved organic nitrogen,DON)对于消毒副产物生成势(specific disinfection byproduct formation potential,SDBPFP)的影响.结果表明,对于常规水质指标浓度而言,在时间上,西江、北江、东江三者基本无变化,但交汇处有稍微的变化,一般在7、10月份浓度偏高;在空间上,各干流及交汇处沿径流方向浓度呈逐渐增大趋势,且交汇处水质指标的浓度普遍高于干流.水体的PO34-浓度、总氮(total nitrogen,TN)浓度最高分别超出《国家地表水环境质量》Ⅴ类水质标准10倍、4倍.溶解性有机碳(dissolved organic carbon,DOC)浓度与UV254呈良好的线性关系,R2=0.901;但DON与卤乙腈(halogenacetonitrile,HANs)浓度的线性关系较差,R2为0.440.卤乙腈生成势(specific halogen acetonitrile formationpotential,SHANFP)与DOC/DON比值基本无线性关系.

Temporal and spatial variations of water quality and N-DBP formation in Pearl River,Guangdong

This report summarizes a two-year study about water quality in the three tributaries,including West River,North River,East Rive and confluence at Guangzhou,of the Pearl River in Guangdong Province.Water samples were collected quarterly in 30 locations along the Pearl River for general water quality and Specific Disinfection Byproduct Formation Potential(SDPBFP) determinations,with emphasis on dissolved nitrogen species.No temporal variation of water quality for the three tributaries was observed.However,the confluence had higher concentration in July and October.Regarding the spatial variation,the confluence in Guangzhou had higher concentrations than the three tributaries for all the measured nutrients,and their concentrations increased with flow path.The concentration of PO3-4 and total nitrogen(TN) exceeded the Class Ⅴ of the Environmental Quality Standards for Surface Water by 10 and 4 times,respectively.In spite of the different terrestrial inputs from different landscapes,a good relationship(R2=0.901) between DOC concentration and UV254 was observed.DON concentration was correlated poorly with HAN concentration(R2=0.440).No relationship between SHANFP and DOC/DON was observed.