磺酸

Methylene blue is reduced and faded by ascorbic acid in the medium of dilute hydrochloric acid（ pH=2） with sulfanilic acid as a catalyst.The optimal conditions of the fading reaction were investigated in detail.Based on this fading reaction a new spectrophotometric method for the determination of ascorbic acid was established.

确定了亚甲蓝与抗坏血酸褪色反应的最佳条件，在 pH=2的缓冲溶液和对氨基苯磺酸存在的条件下，抗坏血酸能够很快还原亚甲蓝并使之褪色，褪色反应的体系具有很好的稳定性。

Four different power samples,sulfanilic acid anhydrous,soluble starch,graphite and calcium carbonate,with different content of carbon were used to determine the influence of element speciation on the properties of laser-induced spectroscopy.

对具有不同碳元素存在形态的4种化学纯试剂(无水对氨基苯磺酸、可溶性淀粉、石墨和碳酸钙)进行激光诱导击穿光谱实验。

Sulfanilic acid,monohydrate

对氨基苯磺酸，一水

This may have resulted from the decomposition of sulfonic acid.

这可能导致从分解磺酸。

At present the performance and price of sulfonic acid PEMs used in PEMFC are deeply concerned.

PEMFC系统中采用的磺酸质子交换膜，其性能和成本一直是人们关注的问题。

Applications and development of perfluorinated sulfonic acid resin are summarized, its structure, performance and applications in PEMFC are discussed.

介绍了全氟磺酸树脂的应用发展概况，讨论了膜的结构、性能以及它们在质子交换膜燃料电池中的应用。

It is confirmed by the FTIR spectra that the sulfonic acid groups have been linked to PS.

通过傅立叶红外光谱表征证明，磺酸基已经被引入到聚苯乙烯的苯基侧链上。

This invention discloses super molecule plant layer 2-benzene group benzimidazole-5 sulfonic acid and its preparation method and application.

本发明提供了一种超分子插层2-苯基苯并咪唑-5-磺酸及其制备方法与用途。

Methods Colitis in rats was induced by colonic administration with 2,4,6trinitrobenzene sulfonic acid.

利用2，4，6三硝基苯磺酸灌肠制备大鼠实验性结肠炎模型。

If a sulfonic acid derivative is used in one of the last stages of synthesis during production of theactive substance, this should be included in the risk analysis.

如果在合成原料药的最后一步使用磺酸衍生物，这应包括下列的风险分析

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％。