水中有机磷化合物光解测定的研究

本文利用1000W高压汞灯,研究了水中有机磷化合物的光解反应条件、共存有机物的干扰及光解反应速度等问题。结果表明,在pH=3.0时,以过硫酸钾为光解氧化剂,辐射10分钟,即可使水中有机磷化合物定量分解为磷酸根。可用于水中有机磷的测定,此法简单、快速,对实际水样测定结果的平均回收率为82.5-106％。

Studies on Photo-Decomposition and Determination of Organic Phosphorus Compounds in Water

UV-irradiation has been known as an effective method for the decomposition of organic phosphorus compounds in water.In this paper,the conditions of photo-decomposition have been studied.We found that K₂S₂O₈ as an photo--oxidant is more effective than other oxidants (e.g.,H₂O₂ which is commonly used).The suitable pHof the medium is about 3.In the range of 217-650μg-P/1,all the compounds studied were quantitatively decomposed within 10 min.The relative standard deviation for the determination is less than_3.6%.The interferences during irradiation process were studied.Finally,the possibility of using this method to determine organic phosphorus in water samples is discussed.