土壤氨氮、亚硝酸盐氮、硝酸盐氮的测定试料保存实验

对测定土壤中氨氮、亚硝酸盐氲、硝酸盐氲的试料保存条件和时间进行研究。结果表明，在4℃、避光保存的条件下，试料可以保存7d，而各组份浓度值基本保持不变。其中，氨氮的本底试料值相对标准偏差为2．86％，加标试料值相对标准偏差为2．88％，加标回收率为85．8％～101％；亚硝酸盐氮加标量为0．5μg试料值相对标准偏差为3．55％，加标量为4．0μg试料值相对标准偏差为2．93％；硝酸盐氮与亚硝酸盐氮总量的本底试料值相对标准偏差为7．02％，加标试料值相对标准偏差为4．56％，加标回收率为82．6％～104％。

Research on Storage Condition for Analysis in Determination of Nitrogen,Nitrite Nitrogen and Nitrate Nitrogen in Soil

The storage conditions of solution for analysis and storage time were studied in determination of nitrogen, nitrite ni- trogen and nitrate nitrogen in soil . The results showed that sample can be stored for 7 days under the condition of 4 ℃ and a- voiding of light. The concentrations of each component values remain unchanged. The relative standard deviation of the ammo- nia nitrogen in background sample value was 2. 86% . The relative standard deviation of spiked sample value was 2. 88% and the recovery was 85.8% ～ 101%. The relative standard deviation of the sample spiked with 0. 5 μg Nitrite nitrogen was 3.55%. The relative standard deviation of sample spiked with 4.0 μg sample was 2. 93%. The relative standard deviation of the background sample values of nitrate nitrogen and nitrite nitrogen was 7. 02% , the relative standard deviation of spiked sample was 4. 56% , the recovery was 82. 6% ～ 104%.