【摘要】 采用负吸收光谱校正技术,研究了在磷酸介质中,溴酸钾存在下,亚硝酸根与吖啶橙反应的吸收光谱。基于负吸光度值或负吸光度之和AT在一定范围与亚硝酸根浓度呈线性关系,建立了双波长负吸收催化光度法测定亚硝酸根的新方法,线性范围1.0×10-5～5.0×10-7mol·L-1,用于环境水样中亚硝酸根的测定获得十分满意的结果。依据亚硝酸根浓度与吖啶橙浓度间没有一定的比例关系,负吸光度AT值与时间呈线性关系,认为在酸性介质中,是亚硝酸根催化溴酸钾氧化吖啶橙褪色的催化氧化还原褪色反应。采用负吸收光谱校正技术,改善了吸收峰形,避免了吸光度差值的计算,提高了方法的准确度。更多还原

【Abstract】 A new method was proposed for the determination of trace nitrite by two wavelength negative absorption catalytic spectrophotometry based on the catalysis of nitrite on the oxidation fading reaction of acridine orange by potassium bromate in phosphoric acid medium. The additive value of negative absorbances at two wavelengths was linear to the nitrite concentration in the range of 1.0×10 -5-5.0×10 -7 mol·L -1. The method has been used to the determination of nitrite in environment water sample with satisfactory result.更多还原