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.
以3，3′，5，5′-四甲基联苯二酚和环氧氯丙烷为原料两步法合成了3，3′，5，5′-四甲基联苯二酚二缩水甘油醚。
3′, 5,5′-tetramethyl-diphenyl diglycidyl ether was synthesized from 3,3′, 5,5′-tetramethyl-diphenol and epichlorohydrin by two-step method.
我们知道许多有毒化学物品对大脑的发育都有影响，这包括铅、甲基汞、多氯联苯、有机磷杀虫剂、阻燃剂和领苯二甲酸盐。
We know that plenty of toxic chemicals are harmful to developing brains—including lead, methylmercury, PCBs, organophosphate pesticides, flame retardants (PBDEs) and phthalates.
同时，富含omega - 3的冷水鱼有可能会使甲基汞和聚氯联苯的含量提高，这两种物质都是神经毒素。
And cold-water fish that are high in omega-3s are also likely to have elevated levels of methylmercury13 and PCBs14, both known neurotoxins.
依据液晶分子结构理论，选择联苯基作为介晶基元，六亚甲基为柔性间隔基，合成了一种丙烯酸酯侧链型液晶高分子。
Based on the liquid crystalline polymer theory, a kind of polyacrylate was synthesized by choosing biphenyl group as rigid nucleus of mesogenic unit and hexylidene as flexible spacing group.
本发明公开了侧向二氟亚甲基醚桥键双末端烷基三联苯及其制备方法与应用。
The invention discloses side difluoro methylene ether bridged bond paired-end alkyl terphenyl, a preparation method and application thereof.
本发明公开了侧向二氟亚甲基醚桥键双末端烷基三联苯及其制备方法与应用。
The invention discloses side difluoro methylene ether bridged bond paired-end alkyl terphenyl, a preparation method and application thereof.
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