九寨沟白水河污染特征研究

通过对2012年4月～2013年3月九寨沟白水河不同断面水样分析，研究了《地表水环境质量标准》（GB3838—2002）中表1“地表水环境质量标准基本项目”的含量变化，并对铬、镉、硒、铜、汞、锌、铅、砷、氨氮、高锰酸盐指数进行污染状况评价。结果显示：镉、铜、汞、锌、铅均未检出；对铬、砷、硒、氨氮、高锰酸盐指数等有检出项目进行单项污染指数和内梅罗综合污染指数评价，水样中铬、砷、硒、氨氮、高锰酸盐指数全年监测平均浓度分别为0．294μg／L、0．024μg／L、0．084μg／L、0．187mg／L、0．695mg／L，用国家水质环境标准的一级标准，所有监测点位（PN〈1）未超标。从单因子污染指数来看，高锰酸盐指数在4月、7月、10月P，〉1，属于轻度污染，初步推断人为活动所致。通过本文的研究发现九寨沟水质依然较好，未受到污染。

Study on the Pollution Characteristics of White River in Jiuzhaigou County

Based on the water analysis resuhs of different sections of White River in Jiuzhaigou County during April 2012 to march 2013, this study investigated the content change of basic items in environmental quality standards for surface water （GB 3838-2002） . Besides, pollution index of Cr, Cd, Se, Cu, Hg, Zn, Pb, As, NH4-N and permanganate indexes were evaluated. The results showed that Cd, Cu, Hg, Zn, Pb were not detected, and Cr, Se, As, NH3-N and IMn, which were found in samples, were evaluated by the single factor index methodand Nemerow multi-factor index method. The whole year average concentration of Cr, Se, As, NH3-N and IMn were 0. 294μg/L, 0. 024 μg/L, 0. 084 μg/L, 0. 187 mg/L, 0. 695 mg/L, with the qualified （ PN 〈 1 ） of all the monitoring sites by using the standard I of national water quality standards. Viewed from the single factor pollution index, the permanganate index Pi 〉 I was in April, Julyand October. The water quality was slightly polluted, preliminary concluded to be caused by human activities. Through this study, it can he conclued that the water quality in Jiuzhaigou County is good and is not polluted.