水中总磷测定各影响因素的探讨及方法优化

总磷是水体质量评价的一项重要指标,其在样品采集保存和实验室测定过程中容易受到各类干扰,历来是水质监测工作中的难点。结合实际工作中的经验,分析并探讨了水中总磷测定过程中的各类干扰因素的影响,提出了对检测各步骤进行严格控制的必要性,并对现有测定方法进行了相应优化。选取四类水样对优化方法进行效果验证,其方法相对标准偏差为1.6%～3.7%,加标回收率达到90%～107%,检出限优于国家标准。结果表明优化方法可更准确高效地测定各类水体中的总磷,有利于提高水中总磷测定的效率及安全性。

The discussion about the interfering factors of total phosphorus determination in water and method optimization

The total phosphorus (TP) was an important indicator for the water quality evaluation. The method was interfered easily during the sample collection, storage and lab-determination process. And it has been the difficulty for water-monitoring. The article analyzed and discussed kinds of interferences during the TP testing, proposed the necessary of strict control for detection steps, and carried out the optimization for the determination method by the practical working experience. The article verified the result and suggestion of optimized method by four kinds of water samples. The precision of method is between 1.6%~3.7%, the recovery is between 90%~107%, and the detection limit (DL) is better than national standard. The testing result showed the optimized method could determine kinds of water more accurately and efficiently, and it was helpful to improve the efficiency and safety of TP determination in water.