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乙酰丙酮法测定纺织品中甲醛时,样品水萃取液的浊度对测定产生影响.用补偿法和离心法消除干扰.补偿法的平均回收率在96.6%~99.8%,相对标准偏差在1.3%~5.0%,说明本方法的测试结果准确可靠,并且操作简单,适用于实际测定. 相似文献
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The ultra fine (<200 nm) inorganic solids (BS) were separated from bitumen which was washed by toluene and centrifugated at 2000 rpm. The result of PAS FTIR and image of TEM showed that the structure of BS particles was smiliar to that of kaolinite clay. On the surface of BS, both toluene insoluble organic matter and structural OH group are detected at the same time.The surface characteristics imparted a bi-wettable nature to the BS. As a result, the BS is able to stabilize fine water emulsion in the bitumen phase. The organic matter associated with BS is a possible factor of the fouling on catalyst and equipment. 相似文献
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在金属加工过程中 ,乳化切削油是目前使用最广泛的一种切削液。乳化切削油由矿物型基础油、表面活性剂、极压润滑剂、防锈剂、杀菌剂等组成 ,使用时用水稀释成 2 % 10 %的溶液 ,稀释液为乳白色。乳化油是依靠其中的表面活性剂降低油、水界面的表面张力 ,形成稳定的水包油乳化体系 ,好的乳化液应具有良好的乳化安定性 ,即油均匀分散在水中 ,不析出油或皂 ,这样的乳化液才能在机械加工中发挥稳定的作用。在乳化油的行业标准SH/T 0 36 5 -1992中 ,规定了乳化液安定性试验方法 ,即将 5 %乳化液 5 0ml置于 5 0ml滴定管中 ,放置 2 4h后观察皂或… 相似文献
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