气相分子吸收光谱法快速测定土壤中亚硝酸盐氮
蓝月存,潘艳,吕保玉,李世龙
广西壮族自治区生态环境监测中心,南宁 530028
Rapid determination of nitrite nitrogen in soils by gas phase molecular absorption spectrometry
蓝月存,潘艳,吕保玉,李世龙
Guangxi Ecological and Environmental Monitoring Center, Nanning 530028, China
摘要:建立气相分子吸收光谱法快速测定土壤中亚硝酸盐氮的方法。土壤样品采样用200 mL 1 mol/L 的氯化钾溶液浸提,于20℃恒温条件下震荡60 min,静置离心。在0.5 mol/L柠檬酸+30%乙醇介质中,用气相分子吸收光谱法测定亚硝酸盐氮含量。结果显示,在0~2.0 mg/L范围内亚硝酸盐氮质量浓度与吸光度呈良好的线性关系,线性相关系数为0.999 9,方法检出限为0.010 mg/L,相对标准偏差为1.32% (n=6),样品加标回收率为93.0%~97.0%。该方法具有操作简单、分析快速准确、干扰少等优点,适用于土壤中亚硝酸盐氮的测定。
Abstract:A method for determination of nitrite nitrogen in soils by gas phase molecular absorption spectrometry was established. The soil samples were extracted by 200 mL 1 mol/L potassium chloride solution, oscillating centrifugation for 60 minutes, on standing. The content of nitrite nitrogen was detected by gas phase molecular absorption spectrometry in 0.5 mol/L citric acid and 30% ethyl alcohol solution. The results showed that the mass concentration of nitrite nitrogen had good linearity with its absorbance in the range of 0-2.0 mg/L, and the correlation coefficient of the linearity was 0.999 9, the detection limits was 0.010 mg/L, the relative standard deviation was 1.32% (n=6), and the recovery of standard addtion was 93.0%-97.0%. This method is simple, rapid and accurate, also it shows low interference, which is suitable for rapid determination of nitrite nitrogen in soils.
关键词:气相分子吸收光谱法;土壤;亚硝酸盐氮
Keywords:gas phase molecular absorption spectrometry; soil; nitrite nitrogen
基金:广西土壤污染与生态修复人才小高地土壤中氮磷分析方法先进性研究
本文引用格式:
蓝月存,潘艳,吕保玉,等.气相分子吸收光谱法快速测定土壤中亚硝酸盐氮[J].化学分析计量,2019,28(6):82-84.
LAN Y C,PAN Y,LYU B Y,et al. Rapid determination of nitrite nitrogen in soils by gas phase molecular absorption spectrometry[J].Chemical analysis and meterage,2019,28(6):82-84.
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