查询词典 formaldehyde

Formaldehyde is absorbed by an acidic saturated solution of 2,4-dinitrophenyl hydrazine and converted to its hydrazone; the hydrazone is then extracted with CS2 and quantitated by GC.

利用尾气中的甲醛与2，4-二硝基苯肼酸性饱和溶液反应生成甲醛腙的特性，通过检测甲醛腙的浓度来检测尾气中的甲醛含量。

China mainly natural gas used in the production of nitrogen, followed by the production of methanol, formaldehyde, acetylene, methylene chloride, carbon tetrachloride, carbon disulfide, nitromethane, hydrocyanic acid and extraction of helium and carbon black. Since the 70s, has built more than natural gas and oil field associated gas as raw materials for large-scale ammonia plant, as well as a number of small and medium-sized ammonia plant, so that the national structure of the synthetic ammonia production of raw materials, natural gas share of about 30%; also be built at the same time A system of acetylene gas plant to manufacture Vinylon and vinyl acetate, acetylene gas used in the production of methanol.

中国天然气主要用于生产氮肥，其次是生产甲醇、甲醛、乙炔、二氯甲烷、四氯化碳、二硫化碳、硝基甲烷、氢氰酸和炭黑以及提取氦气。70年代以来，已兴建多座天然气和油田伴生气为原料的大型合成氨厂，以及一批中、小型合成氨厂，使全国合成氨生产原料结构中，天然气所占的比例约达到30％；同时还兴建了天然气制乙炔工厂，以制造维尼纶和醋酸乙烯酯，乙炔尾气用于生产甲醇。

His urine showed traces of hydrogen cyanide, formaldehyde, lead.

他的尿检显示含量中包括氰化物甲醛和铅

The invention relates to formaldehyde, methanol and N, N-dimethyl hydroxylamine coexisting analysis method.

本发明涉及甲醛、甲醇和N，N-二甲基羟胺共存时的分析方法，属有机化学分析技术领域。

The invention is easy to operate, and has high accuracy. It could take rapid analysis to the coexisting formaldehyde, methanol and N, N-dimethyl hydroxylamine.

本发明的分析方法分析时间短，速度快，操作简易方便，分析精确度较高，可同时对共存时的甲醛、甲醇和N，N-二甲基羟胺进行快速分析。

Today, two systems are used commercially: one is for the deposition of copper by means of formaldehyde as the reducer and another of nickel using either boranates or hypophosphite as reducer .

目前，在塑料上化学沉积金属已经取得工业应用的体系有2种，一种是以甲醛为还原剂的化学镀铜，另一种是硼氰化钾或次磷酸盐为还原剂的化学镀镍。

The resistance, tensile strength and ductibility of formaldehyde's deposit were better than that from sodium hypophosphite solution.

以甲醛为还原剂的化学镀铜层的电导率、抗拉强度、延伸率等物理性能均优于次磷酸钠化学镀铜层。

Originally techniques dropped formaldehyde into the mixture of phosphorous acid and monosodium of imino diacetic acid in high temperature. Owing to phosphorous acid is produced from phosphorus trichloride in industry by hydrolysis, inspissation and crystallization, if we use phosphoros trichloride directly on synthesize N- iminodiacetic acid, not only can simplify operation, but also can reduce the cost and save energy.

原工艺采用的是在酸性条件下高温时将甲醛滴加到亚磷酸与亚氨基二乙酸一钠盐混合溶液中进行反应，考虑到工业上亚磷酸的合成一般采用三氯化磷水解、提浓、结晶制得，直接将三氯化磷用于双甘膦的合成，不仅可以简化操作过程，而且对于降低生产成本和能耗有明显意义。

Twelve different adhesives such as resorcinol-formaldehyde resin, aqueous emulsion-type isocyanine resin, poly emulsion, epoxy resin, etc.

使用了12种黏胶剂，如间苯二酚-甲醛树脂，水乳型异花青树脂，聚乙烯乳状液，环氧树脂等。

The long-term inhalation lf harmful gas such as formaldehyde,benzene,xylene given off from the coatings may harm the immune system and cause leucocythemia,They are especially sensitive to women and children,Pregnant women inhaling benzene may cause malformed baby or abortion .

涂料中的甲醛、苯、二甲醛等释放出的有毒气体，长期吸入人体会损害人体免疫功能，导致白血病，尤其妇女、儿童最为敏感，而孕妇吸入苯会导致胎儿畸形或流产。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。