硫酸

However, the esterification rate and yield reach 94 % and 89 % with the oil of vitriol as catalyst, and the best reaction conditions are that the weight ratio of catalyst and inhibitor are 2.5 % and 0.6 %, the volume of toluene is 60 mL, the molar ratio of MAA and TEG is 2.2:1 and reaction time is 3 h, and the content of TEGDMA is 88 % analyzed by GC.

以浓硫酸为催化剂，当阻聚剂的用量分别为原料的2.5 %和0.6 %，甲苯用量为60 mL，n：n=2.2∶1和反应时间为3 h时，酯化率和产率分别为94 %和89 %，气相分析TEGDMA的质量百分数为88 %。

In this paper,the preparation of tribasic lead sulfate from lead slag formed during tellurium extraction was studied.

研究了以脱碲铅渣为原料制备三盐基硫酸铅的工艺。

Thermodynamic analysis results show that tellurium can be leached by sulfuric acid leaching method from lead-rich tellurium slag.

并通过硫酸浸出高铅碲渣中碲的条件实验验证了热力学分析的结果。

Magnesium sulfate is a cathartics and cinmetic medicine,which has been found a new use to cure pneumonia,chronic cor pulmonale,goronary heart disease,hypertension,peptic ulcer,drarrhea,acute nephritis,migraine,tetanus,tetany,etc in recent years.

硫酸镁为泻药和利胆药，近年来发现其具有治疗肺炎、肺心病、冠心病、高血压、胃十二指肠溃疡、急性腹泻、急性肾炎、偏头痛、破伤风和婴儿手足搐搦症等新用途。

Unstable when heated in the air quickly oxidized iron tetroxide, dissolved in hydrochloric acid, sulfuric acid generated ferrous salt.

不稳定，在空气中加热时迅速被氧化成四氧化三铁，溶于盐酸、稀硫酸生成亚铁盐。

Thin-film evaporator is used to concentrate liquid titanium in production of sulfate titanium dioxide in general.

在硫酸法钛白粉的生产过程中，一般采用薄膜蒸发器进行稀钛液的浓缩。

Part 3 : determination of chromate, iodide, sulfite, thiocyanate and thiosulfate.

第3部分：铬酸盐、碘化物、亚硫酸盐、硫氰酸盐和硫代硫酸酯的测定

A new fluotescence quenching method has been developed to determine nitrite in water samples. The method is based on the diazo-reaction between nitrite ion and thionine in dilute suifuric acid medium.

文章研究了在稀硫酸介质中亚硝酸根与硫堇发生的重氮化反应，基于硫堇的荧光强度随亚硝酸根的加入量增加而明显降低的现象，建立了荧光猝灭法测定痕量亚硝酸根的新方法。

Influences of chloride and thiourea on the nickel anodic dissolution have been discussed under the magnetic field.

并在磁场中研究了氯化物和硫脲对镍在硫酸溶液中的阳极过程的不同影响。

A new fading spectrophotometric method for the determination of chromium is proposed, based on the decoloration of thoron Ⅱ oxidized by chromium in the medium of 0.32 mol/L sulphuric acid.

基于在0.32 mol/L硫酸介质中，铬氧化钍试剂Ⅱ褪色，提出了钍试剂Ⅱ褪色分光光度法测定铬的新方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。