研究了应用乳化剂OP的增色增溶作用，用直接比色法测定废水中镉的最好分析方法与条件。
The hyperchromic and solubilizing effects of emulsifier op and the better analysis method and conditions of determination of cadmium in Waste Water by Spectrophotometry have been studied.
采用双硫腙直接比色法测定镉离子浓度，详细研究了纳米二氧化钛吸附镉离子过程中的影响因素。
Influencing factors on the absorption of cadmium ion by nano-titanium dioxide were studied through direct colorimetry.
试验通过直接皂化-比色法和直接皂化- HPLC两种方法测定了鸭蛋蛋黄粉中胆固醇的含量。
The cholesterol in powder of duck egg yolk was measured by HPLC and colorimetry method after direct saponification in this paper.
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