总氮测定中过硫酸钾的影响  

The Effects of Potassium Persulfate on Total Nitrogen Determination

作　　者：周惜时[1] 秦迎丰 刘丽[1] 李细红[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]西南有色昆明勘测设计院股份有限公司,云南昆明650051

出　　处：《污染防治技术》2010年第4期110-112,123,共4页Pollution Control Technology

摘　　要：应用《水质总氮的测定碱性过硫酸钾氧化-紫外分光光度法》(GB 11894—1989)测定水体中的总氮时,空白试验的吸光值偏高,影响测定结果的准确性。本研究对K2S2O8进行多次重结晶处理,并探讨了不同处理对空白吸光值、工作曲线及模拟水样的影响。结果表明:过硫酸钾重结晶处理,能有效降低总氮测定的空白吸光值,提高工作曲线的灵敏度,增大样品测定的含量范围,提高测定结果的准确度。The accuracy of total nitrogen determination in water following GB11894-1989 was often affected by high blank value.This study discussed the impacts on the blank value,the standard curve and the simulated water samples through the repeated recrystallization processing of potassium persulfate.The results showed that the recrystallization of potassium persulfate could reduce the blank value in determination of total nitrogen effectively,improve the sensitivity of the standard curve,expand the determination range and improve the accuracy of the determination results.

关 键 词：总氮 K2S2O8 影响因素 

分 类 号：X832[环境科学与工程—环境工程] X830.5