Suggested minor improvement:
中:用三氯甲烷连续提取此溶液,每次10-15ml,直至取5ml三氯甲烷层溶液加硫酸铜试液指示观察时, 三氯甲烷层不再呈现黄色。
hyheying 发表:中:用三氯甲烷连续提取此溶液,每次10-15ml,直至取5ml三氯甲烷层溶液加硫酸铜试液指示观察时三氯甲烷层不再呈现黄色。
英:Extract this solution with successive 10- to 15-ml portions of chloroform until a 5-ml portion of the chloroform extract does not assume a yellow color when shaken with cupric sulfate TS.
感觉中文挻复杂的,但英文翻译比较简洁,值得借鉴。