1) the content of total naphthoquinones
总萘醌含量
1.
To establish the method of determining the content of total naphthoquinones in Arnebia euchroma(Royle)Johnst by ultraviolet spectrophotometry,we use chloroform as solvent to determine the absorbency in 516nm and calculate the content of total naphthaoquinones in Arnebia euchroma(Royle)Johnst.
建立了新疆紫草中总萘醌含量的测定方法。
2) naphthoquinone chromophore sulphur atom
含硫萘醌
3) Total naphthoquinone
总萘醌
5) benzoquinone level
苯醌含量
1.
The results show that benzoquinone level changes with the age and sex of the beetles.
结果表明 :各虫态各性别的黄粉虫在不同发育阶段其苯醌含量均有不同 ,各虫态的苯醌含量随日龄而增大 ,雌蛹和雌成虫的苯醌含量均高于同一日龄的雄蛹和雄成虫。
6) naphthalene content
萘含量
1.
As the composition of diesel oil mixtures are complicated and their properties are similar to each other,a method of using gas chromatography to determine the naphthalene content in the circulative diesel oil formed in the purifying process was developed and the detection conditions were confirmed.
鉴于精脱萘工艺柴油成分复杂,混合物性质极为相近的特点,开发了采用气相色谱法测定循环柴油中萘含量的分析方法,并确定了其检测条件。
2.
In view of the problems that exist in the methods determining the naphthalene content in coal tar,analysis and research of the determination method have been repeatedly carried out in the hope to improve it,and a distillation chromatography method has finally been developed.
针对目前煤焦油中萘含量测试方法存在的问题,进行了分析研究,并对常用的测定方法进行了改进,开发了蒸馏-色谱法。
3.
Two methods of distillation crystallization method and gas chromatography to determine the naphthalene content in coal tar oil were introduced.
介绍煤焦油中萘含量测定的两种方法:蒸馏结晶法和气相色谱法,对两种方法的优缺点及分析结果进行了对比。
补充资料：总氯含量测定
分子式：
CAS号：
性质：氯丁橡胶中总氯含量的测定方法常用的有两种：氧瓶燃烧法和容量法。氧瓶燃烧法是将试样在铂丝为催化剂条件下燃烧，将氯转化为钾盐，再以硝酸汞标准溶液滴定。容量法是将试样与碳酸钠-硝酸钾混合物于350～400℃下熔融分解为氯化氢，同时转化成氯化物，再以硝酸银容量法测定。这些测定方法同时亦可以用于测定氯化丁基橡胶和氯磺化聚乙烯中氯含量。
CAS号：
性质：氯丁橡胶中总氯含量的测定方法常用的有两种：氧瓶燃烧法和容量法。氧瓶燃烧法是将试样在铂丝为催化剂条件下燃烧，将氯转化为钾盐，再以硝酸汞标准溶液滴定。容量法是将试样与碳酸钠-硝酸钾混合物于350～400℃下熔融分解为氯化氢，同时转化成氯化物，再以硝酸银容量法测定。这些测定方法同时亦可以用于测定氯化丁基橡胶和氯磺化聚乙烯中氯含量。
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参考词条