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应用苯胺-α-萘酚分光光度法测定水样中的亚硝酸盐

ANILINE-α-NAPHTHOL SPECTROPHOTOMETRIC DETERMINATION OF NITRITE IN WATER SAMPLE

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【作者】 啜惠民赵惠芝朱宝昌田华张银茹

【Author】 CHUO Hui-min, ZHAO Hui-zhi, ZHU Bao-chang, TIAN Hua, ZHANG Yin-ru (Dept of Chemistry, Hebei Normal University of Science & Technology, Qinhuangdao Hebei, 066600,China)

【机构】 河北科技师范学院河北科技师范学院 河北秦皇岛066600河北秦皇岛066600

【摘要】 实验研究了应用苯胺-α-萘酚分光光度法测定水样中的亚硝酸盐的含量。其原理为苯胺与亚硝酸钠在盐酸介质中重氮化,然后在NaOH溶液中与α-萘酚生成桔红色偶联产物。实验结果表明:偶联产物的最大吸收波长为480nm,线性范围是0~0.96mg/L,其线性回归方程相关系数为0.9976,表观摩尔吸收系数ε480为2.53×103L/(mol·cm),最低检出限为0.08mg/L,可用于水样中亚硝酸根的测定。

【Abstract】 The content of nitrite in water sample was determined with aniline-α-naphthol spectrophotometry based on the principle that aniline and nitrite were diazotized in medium of hydrochloric acid, then formed orange color production in alkaline medium coupled with α-naphthol. The results showed the maximum absorption wavelength of orange color production was 480 nm, the linear range was 0~0.96 mg/L, the coefficient related to linear regression equation was r=0.997 6,the apparent molar absorptivity was 2.53×10~3 L/(mol·cm), and the lowest detection limit was 0.08 mg/L. It can be applied to determine nitrite in water sample.

【关键词】 亚硝酸根苯胺α-萘酚分光光度法
【Key words】 NitriteAnilineα-naphtholspectrophotometry
  • 【文献出处】 河北职业技术师范学院学报 , 编辑部邮箱 ,2003年04期
  • 【分类号】X832
  • 【被引频次】3
  • 【下载频次】160
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