共查询到20条相似文献,搜索用时 218 毫秒
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详细介绍了离子色谱仪测定氟树脂涂料中溶剂可溶物氟含量的检测方法,通过方法验证试验表明,本方法线性范围广,检出限和定量限低,精密度良好,回收率高。 相似文献
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采用红外光谱通过建立氟含量定量分析标准工作曲线,选择C—F键特征吸收峰所在的1 400~1 000 cm-1光谱区域作为定量分析信息区,对涂料溶剂可溶物氟含量进行定量分析,并用氟离子电极法对结果准确性进行验证。结果表明,当C—F的质量浓度为1.3~13 mg/mL时,线性回归方程为A=1.04[ρ(C—F)/(mg.mL-1)]+5.15(R2=0.987);与氟离子选择电极法对比,回收率在可接受范围内。该方法简单可行、准确可靠,可用于涂料溶剂可溶物氟含量。 相似文献
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黄逸东 《中国石油和化工标准与质量》2006,26(3):11-13
介绍了测定交联型氟树脂涂料中溶剂可溶物氟含量的方法。分析了影响试验结果的主要因素。试验表明:样品的前处理、氟电极实际斜率的测定以及电位的测定会给测试结果带来较大的影响。 相似文献
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介绍了一种新的测试方法即核磁共振法(NMR)在牙膏可溶氟含量测试中的应用,并与国家标准方法做了简单的比较。 相似文献
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The comparative acid resistance of a series of enamels was determined by the loss-in-weight test and by the spot test. The stability of the red color oxide in these enamels was also studied by varying the alumina, fluoride, soda, and potassia contents in the frit. Improved acid resistance was obtained with no alumina and no fluoride in the frit. The stability of the red color was markedly influenced by the fluoride content; the absence of fluoride in the frit gave very poor stability. 相似文献
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为有效利用不溶性含钾岩石(主要成分为钾长石、铁的化合物等)中的各种有价元素,采用氟化铵将不溶性含钾岩石处理成为酸可溶物,进一步生产硫酸钾等产品。其工艺步骤包括:1)不溶性含钾岩石前处理;2)氟化铵处理不溶性含钾岩石;3)氟化铵处理后的产物过滤;4)氟化铵处理后的产物酸解;5)硫酸处理后的产物水溶;6)调pH分级沉淀后得硫酸钾溶液;7)氟化铵溶液再生和回用。涉及的工艺过程温度低,易于控制,反应收率高。该工艺氟化铵循环使用,综合利用了不溶性含钾岩石的各种有价元素,有效降低了各种产品的生产成本,使本技术有较好的经济效益。 相似文献
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作为固体危险废物,电解铝大修渣浸出液中含有大量氟离子,其处理处置都需测定氟离子含量。目前,测定大修渣浸出液中氟离子含量的方法普遍采用的是GB 5086.1—1997《固体废物 浸出毒性浸出方法 翻转法》,耗时长、效率低。针对这一问题,提出了一种快速测定大修渣浸出液中氟离子含量的方法,即通过强化固液界面传质过程,促进大修渣中可溶性氟化物的固液转移,从而大大提高了检测效率,由18 h缩减至0.5 h。实验结果表明,大修渣氟离子浸出质量为9 000~70 000 mg/kg,相对标准偏差均小于5.0%,加标回收率为96.35%~108.8%,说明快速测定法测定结果稳定,准确性高,有望成为测定大修渣浸出液中氟离子含量的标准方法。 相似文献
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以LiNO3、Al(NO3)3·9H2O、LiF和MnNO3为原料,通过控制n(Li)/n(Mn)和Al、F掺杂量,溶胶-凝胶-微波法在750℃下合成阴阳离子复合掺杂型Li1.00Al0.05Mn1.95O3.95F0.05电极材料。XRD实验证明Li1.00Al0.05Mn1.95O3.95F0.05为纯尖晶石结构。掺杂适量的Al可以改善材料的循环性能,掺杂氟不但可以不降低材料的初始比容量而且可以显著降低材料在高温使用时的容量损失。Li1.00Al0.05Mn1.95O3.95F0.05在室温条件下的首次放电比容量达到115mAh/g,循环50次后放电比容量仍保持在109mAh/g,即使在55°C的高温,50次的总容量损失率也仅有10.1%。 相似文献
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The effect of fluoride ions on the corrosion of aluminium in sulphuric acid and zinc electrolyte has been investigated through thermodynamic analysis and corrosion experiments. The solution chemistry of aluminium, zinc, and iron in aqueous solution in the absence and in the presence of fluoride ions was studied with the construction of the Eh-pH diagrams for the Al–F–H2O, Zn–F–H2O and Fe–F–H2O systems at 25°C. In the presence of fluoride ions, aluminium can form a series of aluminium-fluoride complexes depending on the fluoride concentration and pH whereas zinc and iron can form soluble or insoluble metal-fluoride complex species only at relatively high fluoride concentration and at higher pH values. Experimental results show that in the presence of fluoride ions, the corrosion of pure aluminium in sulphuric acid is due to uniform dissolution and the reaction rate depends on the fluoride concentration. In zinc electrolyte containing fluoride ions, zinc deposits onto the pure aluminium substrate spontaneously and the amount of deposited zinc also depends on the fluoride concentration. On the other hand, the presence of iron in the Al–Fe alloy accelerates the corrosion of aluminium in H2SO4 and zinc electrolyte significantly and prevents the deposition of zinc on the aluminium surface. The effect of fluoride ions on zinc adherence to the aluminium is also discussed. 相似文献
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A technology for the granulation of Fe-Al-Ce nano-adsorbent (Fe-Al-Ce) in a fluidized bed was developed. The coating reagent, a mixture of Fe-Al-Ce and a polymer latex, was sprayed onto sand in a fluidized bed. The granule morphology, coating layer thickness, granule stability in water and adsorption capacity for fluoride was investigated by analyzing samples for different coating time. The coating amount was from 3% to 36%. With increasing coating amount, granule stability decreased and adsorption capacity increased. FTIR analysis showed that the latex can react with active hydroxyl on the Fe-Al-Ce adsorbent, which led to a decrease of the adsorption capacity. Coated granules with a coating amount of 27.5% had a fluoride adsorption capacity of 2.22 mg/g (coated granules) at pH 7 and initial fluoride concentration of 0.001 M. A column test showed that 300 bed volumes can be treated with the effluent under 1.0 mg/L at an initial fluoride concentration of 5.5 mg/L, space velocity of 5 h− 1 and pH of 5.8. The coating granulation of the Fe-Al-Ce adsorbent can produce granules that can be used in a packed bed for the removal of fluoride from drinking water. 相似文献
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认证了测定氟化物时当氟电极洗涤的最大空白值不同和电极电位漂移的情况下,用一点校正法解决样品测量中的稳定性和重现性差及准确度不高的问题。 相似文献
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PVDF纤维湿纺研究 总被引:1,自引:0,他引:1
本文论述了PVDF(偏二氟乙烯)等可溶性含氟树脂以DMSO(或DMF)为溶剂的湿法纺丝工艺,着重对影响氟物性的有关因素进行了讨论与阐述. 相似文献