Determination of Nitrate Nitrogen in Groundwater by Direct Ultraviolet Spectrophotometry
Determination of Nitrate Nitrogen in Groundwater by Direct Ultraviolet Spectrophotometry
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发表时间：
2006
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通讯作者：
Zheng Xian
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作者：
Zheng Xian
在不含有机污染物的地下水中，硝酸根是唯一在紫外光下有很强吸收的无机阴离子，在1- 36 mg/L范围内，最佳检测波长为236 nm，对3种不同浓度的地下水样品测定的相对标准偏差（n=8）分别为0.10%、0.22%和0.37%，回收率为98.3%。地下水中共存的Cl-、SO2 - 4、HCO-3等无机阴离子对测定的干扰很小。
In the groundwater without organic contaminant,nitrate is the only inorganic anion that have a very strong absorbance in the ultraviolet light.In the range of 1—36mg/L,the optimum detection wavelength is 236nm.The relative standard deviations(n=8) of the determination for the three different concentrations of the groundwater samples were 0.10%,0.22% and 0.37% with recoveries of 98.3%,99.7% and 102.0%,respectively.Other coexisted inorganic anions in the groundwater, such as Cl-,SO 2- _4,HCO-_3,were found to have very little interference in the determination.