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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。
The water contains a certain concentration of formaldehyde, measured by the Nessler method of total ammonia nitrogen (TAN) concentration is much higher than the actual concentration, the percentage difference up to 450.60%; with hypochlorite phenate method measured total Ammonia nitrogen (TAN) concentration was significantly lower than the actual concentration, the percentage difference up to 84.77%. Formaldehyde concentration in the range of 10 ~ 40 mg / L and TAN concentration in the range of 1 ~ 10 mg / L, the following correctives were obtained by two-factor crossover experiment: (1) When Tess was measured by Nessler method, Y = 4 .0 5 2 9- 0 .0 72 4 x1 +0 .2 0 6 4x2 with a standard deviation of 1.3381; (2) When TAN is measured by the hypochlorite phenate method, Y = 0 .1196 +0 .0 345 x1 + 1.0 0 2 2 x2, standard error is 0 .4 6 2 7. Y is the actual TAN concentration (mg / L), x1 is the formaldehyde concentration (mg / L) and x2 is the measured TAN concentration (mg / L). The comparison of the concentration of formaldehyde in ammonia-free water with that of ammonia-free water showed that there was no significant difference.