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目的通过对配制好的不同浓度的太原市市政水样本进行连续多天监测获得生活饮用水中硝酸盐的有效检测时限及变化规律。方法采用SAS统计学方法重复测量资料方差分析探讨水中硝酸盐的影响因素。结果本次实验主要从时间以及酸度两个因素对硝酸盐项目的影响入手:研究时间影响得到第1 d与各天的P值均小于0.05;实验组24 h变化率均值为0.074,对照组24 h变化率约为0.146;固定时间因素分析加酸对实验组和对照组影响:P>0.05。结论采样后水溶液的有效放置时间最好是1 d(24 h),而且越快检测结果越有意义;对照组稳定性较实验组稍差;保存剂(98.08%发烟硫酸)对水样中的硝酸盐有一定的保护作用,但对硝酸盐含量的影响没有统计学意义;硝酸盐24 h变化率数据显示:硝酸盐的浓度与稳定性成正比,浓度越大其稳定性越好。
OBJECTIVE To determine the effective detection time and variation of nitrates in drinking water by continuously monitoring the prepared municipal water samples of different concentrations in Taiyuan City for many days. Methods SAS statistical methods repeated measurements of variance analysis to explore the impact of nitrate in water. Results The experiment mainly started with the influence of time and acidity on the nitrate project. The P values of the first day and the third day of the study were all less than 0.05. The mean change rate of the experimental group at 24 h was 0.074, while the control group 24 h change rate of about 0.146; fixed time factor analysis of acid on the experimental group and control group: P> 0.05. Conclusions The effective time of aqueous solution after sampling is 1 d (24 h), and the faster the test result, the more stable the control group is. The preservative (98.08% oleum) Of nitrate had some protective effect, but had no significant effect on the nitrate content. The change rate of 24 h of nitrate shows that the concentration of nitrate is proportional to the stability, and the stability of nitrate is better as the concentration of nitrate is higher.