核固红共振光散射法测痕量亚硝酸根

Determination of trace nitrite by resonance light scattering method with nuclear fast red

目的：建立测定痕量亚硝酸根的新方法。方法：在盐酸介质中痕量亚硝酸根与核固红发生重氮化反应,使得核固红溶液的共振散射光强度明显下降,从而建立了共振光散射法测定痕量亚硝酸根的新方法。结果：方法的线性范围为2.0×10^-8～2.8×10^-7g/ml,检出限为9.34×10^-9g/ml,回收率为95.5%～98.6%。结论：该方法简便快速,用于环境水样中痕量亚硝酸根的测定,结果满意。

Objective：To develop a new method for the determination of trace nitrite in water. Methods：Based on the diazoreaction of nitrite with nuclear fast red in hydrochloric acid medium, which resulted in the decrease of resonance light scattering, a resonance light scattering method was proposed for the determination of trace nitrite. Results： The determination limit and the linear range for nitrite were 9. 34 ×10^-9 g/ml and 2.0×10^-8～2.8×10^-7g/ml, respectively. The recovery rate was 95.5% - 98. 6%. Conclusion：The method is quick and simple. It can be applied to the determination of trace nitrite in water samples of environment with satisfactory results.