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本法选用铬天青S(CAS)和溴代十六烷基吡啶(CPB)测定某些食品中的铝,发现方法本身重现性不理想,主要原因在于试剂空白对水的吸光度随温度增高而增大,波动幅度亦增大。但与溶液pH无关。30℃时,同时作5个试剂空白,对水的吸光度最大差值达0.103,而铝标准色列对水的吸光度变化很小,因此,没有稳定的试剂空白,色列的重现性就不理想。作者将分别加入HCl、CAS-CPB和缓冲液的操作改为混合显色
This method selects chromium azurol S (CAS) and cetyl pyridinium bromide (CPB) determination of aluminum in some foods, found that the reproducibility of the method itself is not ideal, mainly due to reagent blank water absorbance increases with temperature The increase, the volatility also increased. But has nothing to do with the pH of the solution. At 30 ° C, at the same time, a blank of 5 reagents was used, and the maximum difference in absorbance of water was 0.103. However, the change of absorbance of aluminum standard color column to water was very small. Therefore, without stable reagent blank, the reproducibility of color column was not ideal. The authors changed the operation of adding HCl, CAS-CPB and buffer separately to mixed color development