浓硫酸中含量检测方案(密度计)

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美国鲁道夫密度计用于浓硫酸含量的测定 The Density 密度计-用于浓 H2SO4浓度的测量： As the concentration of the sulfuric acid increases， the density also increases. This fairly linearrelationship continues from 0% acid up to approximately 96% or 97%. However， somewherearound 94 to 95% the linear relationship starts to become a bell curve； the concentration/densityrelationship starts curving back on itself. Therefore， the densities of sulfuric acid at these highconcentrations have two different possible concentrations!! That is， for example， 99% and 93%sulfuric acid may have the same exact density! Concentrations may be measured to 98% if usingone standard concentrationtable. 在电池行业，我们都会使用仪器去测量硫酸的浓度，随着硫酸浓度的增加，其密度值也会随之增高，密度与浓度的关系在0-96%的范围之间还是比较的线性的，然而在有些情况下，我们会发现在94%95%浓度的硫酸，其浓度与密度的线性关系会出现开口向下的曲线，所以对于高浓度硫酸，在相同密度的情况下，会有二个可能的浓度值，简单的说，就是93%和99%浓度的浓硫酸的密度值是完全相同的. Material Compatibility with H2SO4 测量浓硫酸的材料要求 The internal wetted materials of the DDM 2911 density meter are： Borosilicate glass PTFE， andHalar. All these material have an“Excellent” rating for their resistance to attack from H2SO4. The only material concern is the silicone tubing used for the waste drain line! This external tubingis supplied to us by Tygon BioPharma Silcone； Tubing Formulation # 3350. This transparenttubing is good for mild to medium concentrations of bases， salts， alcohols， andacetone. However， it is not recommended for acids， in particular sulfuric acid even at lowerconcentrations. Sulfuric Acid will dissolve this on contact! For Sulfuric acid I would recommendViton tubing. This opaque black tubing is good for most all acids. But it is not good for acetone.Acetone will slowly eat away at this Viton tubing； use alcohol for drying. The external tubing is easily changed as required for an application. Just replace with tubing ofsuitable material of a similar size (1/8"IDx3/16"OD- or- approximately 3mm ID x 5mm OD). DDM2911 密度计内部和硫酸接触的元器件包括：U 型震荡管， PTFE 和 Halar 材质，所有这些材料都可以很好的耐浓硫酸腐蚀的材料，唯一需要关注的地方是排废液管的材质，一般情况下，废液管采用Tygon BioPharma Silcone 公司的硅胶管，该硅胶管可以耐受低浓度的硫酸，以及盐类，酒精，丙酮等，对于高浓的硫酸，这种硅胶管不能长期使用，我们会更换为 Viton 材质的废液管， Viton 材质可以耐受绝大部分的强酸，但是 Viton 又不能耐受丙酮，只能使用乙醇作为清洗溶剂. Cautions to be taken with H SO4 测量硫酸的注意事项 First and foremost， wear proper protective equipment， gloves， safety glasses， etc. Sulfuric Acidis very corrosive to human tissues! Also， care needs to be taken during the cleaning out of the acid； remember that sulfuric acidreacts exothermally with water! So push the sulfuric acid out with and empty syringe using airpressure- only once nearly all the sulfuric acid is out of the u-tube can you use diluted sulfuricacid as the first rinse； again， push it out with just the air pressure from an empty syringe. Thenand only then may you rinse with water as a solvent. Use alcohol as the final drying rinse asacetone with dissolve the black Viton tubing. 首先要带好手套，安全眼镜等保护设备，硫酸对人体有强腐蚀性，而且在清洗这些酸的过程中尤其需要注意安全，另外一点，硫酸遇水会发热，所以测量完的浓硫酸需要用空的注射器排空，然后再用水稀释一遍，再用空的注射器排空，再用水去清洗样品管，最后用乙醇清洗并吹干样品管. 美国鲁道夫密度计： 大昌华嘉商业(中国)有限公司版权所有 联系我们 大昌华嘉商业(中国)有限公司 联系方式：4008210778 邮箱地址： iinns.cn@dksh.com 公司网址：www.dksh-instrument.cn DDM2911 密度计内部和硫酸接触的元器件包括: U 型震荡管, PTFE 和 Halar 材质, 所有这些材料都 可以很好的耐浓硫酸腐蚀的材料。