Nagaraj P, Prakash J S, Shivakumar Anantharaman, Shrestha Ashwinee Kumar
Department of Studies in Chemistry, University of Mysore, Manasagangothri, Mysore, 570006, India.
Environ Monit Assess. 2008 Dec;147(1-3):235-41. doi: 10.1007/s10661-007-0115-3. Epub 2008 Jan 19.
Two spectrophotometric methods have been developed for the determination of nitrite using dapsone (DAP) with alpha-naphthol and 4-amino-5-hydroxynapthalene-2,7-disulphonic acid monosodium salt (AHNDMS) as chromogenic reagents with maximum absorbance wavelength at 540 and 520 nm respectively. For the method that utilizes dapsone with alpha-naphthol (DAP-alpha-naphthol), the beer's law range is obeyed between 0.05-0.8 microg ml(-1) with molar absorptivity of 5.749 x 104 l mol(-1) cm(-1). The second method that uses dapsone with AHNDMS (DAP-AHNDMS), the beer's law is valid over the range 0.2-1.4 mug ml(-1) and molar absorptivity 2.44 x 104 l mol(-1) cm(-1). The common interfering ions in the analytical procedures have been studied. This proposed methods are reliable, reproducible and have been successfully applied to determine nitrite in various water sources of environmental interest.
已开发出两种分光光度法用于测定亚硝酸盐，分别使用氨苯砜（DAP）与α-萘酚以及4-氨基-5-羟基萘-2,7-二磺酸单钠盐（AHNDMS）作为显色剂，最大吸收波长分别为540和520 nm。对于使用氨苯砜与α-萘酚的方法（DAP-α-萘酚），在0.05 - 0.8 μg ml⁻¹范围内符合比尔定律，摩尔吸光系数为5.749×10⁴ l mol⁻¹ cm⁻¹。第二种使用氨苯砜与AHNDMS的方法（DAP-AHNDMS），比尔定律在0.2 - 1.4 μg ml⁻¹范围内有效，摩尔吸光系数为2.44×10⁴ l mol⁻¹ cm⁻¹。已研究了分析过程中常见的干扰离子。所提出的方法可靠、可重现，已成功应用于测定各种环境相关水源中的亚硝酸盐。
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