甲醛对Nessler法和次氯酸酚盐法测定养殖水体总氨氮的影响Effects of Formaldehyde on Measurement of Total AmmoniaNitrogen Concentration by Nessler and Salicylate Methods
罗国芝,谭洪新,朱学宝,霍少勇
摘要(Abstract):
水体中含一定浓度的甲醛 ,用 Nessler法测得的总氨氮 (TAN)浓度远远高于实际浓度 ,差异百分数最高达 4 5 0 .0 6 % ;用次氯酸酚盐法测得的总氨氮 (TAN)浓度则明显低于实际浓度 ,差异百分数最高可达 84 .77%。甲醛浓度范围为 10~ 4 0 mg/ L、TAN浓度为 1~ 10 mg/ L,通过双因素有重复观察值的交叉实验 ,得到如下矫正式 :(1)用 Nessler法测 TAN时 ,Y=4 .0 5 2 9- 0 .0 72 4 x1+ 0 .2 0 6 4x2 ,标准误差为 1.3381;(2 )用次氯酸酚盐法测 TAN时 ,Y=0 .1196 + 0 .0 345 x1+ 1.0 0 2 2 x2 ,标准误差为 0 .4 6 2 7。 Y为 TAN实际浓度 (mg/ L) ,x1为甲醛浓度 (mg/ L) ,x2 为测得的 TAN浓度(mg/ L )。比较含氨氮水体与不含氨氮水体中的甲醛浓度 ,方差分析结果表明 ,没有显著差异。
关键词(KeyWords): 甲醛;总氨氮浓度;Nessler法;次氯酸酚盐法
基金项目(Foundation): 上海市科技兴农重点攻关项目 [农科攻字 ( 2 0 0 0 )第 6 -1 0号 ];; 上海水产大学校长科研基金项目 ( SFU2 0 0 0 0 1 )
作者(Author): 罗国芝,谭洪新,朱学宝,霍少勇
DOI: 10.16441/j.cnki.hdxb.2002.03.012
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