基于离子色谱法的生活饮用水中有机酸的检测研究

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Abstract： In order to solve the problems of low separation efficiency and poor selectivity in the detection of trace organicacids in drinking water，an ion chromatography-electrochemicalanalysis method was established.The detection system was constructed by using a high-capacity anion exchange column AS29 and nano-gold/graphene composite modified electrodes， the dynamic pH gradient elution program and pulsed amperage detection mode were optimized，and the integratedon-line solid-phase extraction pretreatment technology was used to eliminate matrix interference.The results showedthat the seven target organic acids werecompletely separated within 15 minutes，and the detection limit of maleic acid was ， the determination deviation is within 8% under 200mg.L-1 chloride ion interference.The method was applied to the monitoring of direct drinking water system，and it was found that the maleic acid content in the final ladder watersample was higher than thatof the factory water，which could efectively reflectthe accumulation trend of disinfection by-products.

Keywords： ion chromatography; drinking water; organic acids

饮用水中痕量有机酸作为重要的水质评估指标，其含量变化可反映水体污染、消毒副产物积累等关键信息[1]。（剩余3857字）