肉制品中亚硝酸盐含量催化比色测定

本文根据亚硝酸根在酸性条件下能促进氯酸钾氧化考马斯亮蓝G反应,建立了肉制品中亚硝盐含量测定新方法。最大吸收峰590nm,线性范围0～0.50×10^(-5),回收率94～109％。

新的碘催化比色测定法及其在油气化探中的应用

以 F e( SCN) 3-Na NO2 为本底反应的碘催化比色测定方法灵敏度高 ,检出限达 10 - 8,线性范围宽 ,精密度、准确度高 ,分析简便、快速。本方法在油气化学勘探应用中取得了良好的效果。

岩石中氯的催化比色测定

A procedure of catalytically colorimetric determination has been established of chlorine in rocks.A certain quantity of sample is taken and fused with NaOh before water-immersion extraction.After its pH is adjusted to 7 with 70% HClO4 and 4% NaOH(v/v),the solution is transfered to a 100c.c volumetric flask.Only a small portion of it is taken for the measurement of absorbance on a colorimeter by either constant time method or constant eoncentration method.This procedure is simple,rapid and well reproducible.The limit of detection is 1×10^-1μg/ml and the coefficient of variation 7.35.It in most eases,gives satisfactory results for catalytically colorimetrie determination of ehlorine contained in rocks.

加速氧化比色测定肉制品中亚硝酸盐含量

根据亚硝酸盐能够加速碘酸钾氧化甲基橙退色的原理,建立了肉类制品中微量亚硝酸盐含量的比色测定,反应体系的最大吸收峰为340nm,亚硝酸盐测定的线性范围是0～7.5ug ,回收率达80％～102％。