The sample is dissolved in nitric and fluoric-hydro acid adding sulfuric acid, and heating up to fuming, then the matrix element titanium is separated with sodium hydroxide.

试样用硝酸—氢氟酸溶解，硫酸冒烟后强碱分离钛、铁、镍离子，其余干扰离子用酒石酸钾钠掩蔽。

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According to the trait of rocket propellant a kind of protective gloves made of composite fluorine rubber is developed which can be used to protect the skin of red fuming nitric acid worker.

针对火箭推进剂作业的特点，研制了一种以复合氟橡胶为主体材料的防护手套，可用于红烟硝酸作业人员的皮肤防护。

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The PS water reducing agent, which is very effective for concrete, has been made from waste poly styrene(WPS) by sulfuric acid of fuming sulfuric acid sulfonation process.

以废聚苯乙烯（WPS）泡沫为原料，采用浓硫酸和发烟硫酸两种磺化方法制备性能良好的砼减水剂。

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