介绍用四甲基联苯胺分光光度法测定水中余氯的原理、氯标准曲线的绘制、样品测试，该方法的结果与讨论。
The principle of spectrophotometry with tetramethyl-benzidine, the drafting of chlorine standard curves, sample tests, and the results and discussions of the method are introduced.
对四甲基联苯胺显现潜血手印在实际工作中遇到的不足进行了优化，结合案例，运用比较的方法说明优化前后显现效果的不同。
The method of manifesting latent handprint with tetramethylbenzidine is optimized in work practice, which results in different manifestation effect compared with that of pre-optimization.
对四甲基联苯胺显现潜血手印在实际工作中遇到的不足进行了优化，结合案例，运用比较的方法说明优化前后显现效果的不同。
The method of manifesting latent handprint with tetramethylbenzidine is optimized in work practice, which results in different manifestation effect compared with that of pre-optimization.
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