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Comparison of three chemical detection principles for carbon and sulfur analysis (2)
Release time: 2019-12-05 11:54:51 Click: 926
，分析速度比较慢，但是结果比较准确。 I introduced two methods of analyzing carbon and sulfur last time, and this time I will introduce three methods of measuring carbon and sulfur, namely non- aqueous fixed carbon and potassium iodate volumetric method for sulfur, conductivity method for carbon and sulfur, and coulomb method Carbon and sulfur, these methods all use chemical reagent solutions , the analysis speed is slow, but the results are more accurate.
Determination of sulfur by non-aqueous carbon and potassium iodate volumetric method
），预热0.5-1min ，通氧燃烧（氧气流量 1-2L/min ）生成 SO2 和 CO2 气体，经除尘管导入硫，碳吸收杯中，当淀粉吸收液中的纯蓝色逐渐变淡时，随机用 KIO3 溶液，碱性非水溶液滴定硫，碳，将近终点时，间断通氧 1-2 次，继续滴定至溶液呈原来的纯蓝色终点。 Place the sample in a porcelain boat, add an appropriate amount of co-solvent, push the porcelain boat into the high temperature area of the combustion furnace (1200-1250 degrees ), preheat for 0.5-1min , and burn with oxygen (oxygen flow 1-2L / min ) to generate SO2 And CO2 gas are introduced into the sulfur through the dust removal tube, and in the carbon absorption cup, when the pure blue in the starch absorption solution gradually fades, the sulfur and carbon are titrated with KIO3 solution and alkaline non-aqueous solution at random. 1-2 times, continue to titrate until the solution has the original pure blue end point. KIO3 标准溶液和碱性非水溶液的毫升数及相应标准试样求得的滴定度，求出硫和碳的含量。 According to the milliliter of the consumed KIO3 standard solution and alkaline non-aqueous solution and the titer obtained from the corresponding standard sample, the content of sulfur and carbon was obtained. WM3012-87 ）。 The non- aqueous titration method is a standard method for measuring carbon in carbon steel and high, medium and low alloy steel ( WM3012-87 ).
The potassium iodate capacity method is the standard method for determining sulfur in pig iron powder, carbon steel, alloy steel, high temperature alloy, precision alloy, antimony, and silver. 20 世纪 70-80 年代该方法在我国广泛应用。 This method was widely used in China in the 1970s and 1980s .
Carbon and sulfur measurement by conductivity method
CO2 和 SO2 混合气体首先导入硫的电导吸收池，池中含有酸性氧化剂的硫吸收液（常用氧化剂有 KIO4,H2O2 等）， SO2 氧化并产生 H2SO4, 引起吸收液氢离子浓度增加，其增值与硫含量成正比例，再经电脑处理，可以显示并打印出硫的含量。 The conductivity method is used to measure the carbon content. The sulfur content is that the CO2 and SO2 mixed gas generated by the combustion method are first introduced into the conductivity absorption cell of sulfur. The cell contains an acidic oxidant sulfur absorption solution (common oxidants are KIO4, H2O2, etc.). H2SO4 causes the hydrogen ion concentration in the absorption liquid to increase. Its value-added is directly proportional to the sulfur content. After processing by the computer, the sulfur content can be displayed and printed. SO2 的混合气体再导入碳吸收池，吸收池中装有能吸收 CO2 的溶液（如 NaOH,Ba （ OH ） 2 等），当导入 CO2 后，溶液的电导发生变化，并改变值与 CO2 的量成正比，经电脑处理，可数显并打印出碳的含量。 Conductivity measurement of carbon is to introduce the mixed gas that has absorbed SO2 into the carbon absorption cell. The absorption cell contains a solution that can absorb CO2 (such as NaOH, Ba ( OH ) 2 etc.). When CO2 is introduced , the conductivity of the solution changes. , And change the value is directly proportional to the amount of CO2 . After computer processing, it can be digitally displayed and printed out the carbon content. 60 秒。 The entire process is completed automatically in 60 seconds.
1X10-6 。 Conductivity method is mostly used for the determination of low carbon and low sulfur, and the lower limit of detection can reach 1X10-6 . It can be used to determine the standard sulfur content of tungsten powder, tungsten trioxide, tungstic acid, molybdenum powder, molybdenum trioxide, and ammonium molybdate.
Coulomb method for carbon and sulfur
1300 度左右通氧，试样中的碳转化为 CO 2 ，并导入已经 PH 值的 Ba(ClO 4)2 溶液中，反应生成 HClO 4 和 BaCO 3 沉淀，由于氢离子浓度的增加，溶液的 PH 值发生变化，用脉冲电解方法使溶液的 PH 值恢复至原值。 The Coulomb method calculates the carbon content of the sample based on the amount of electricity consumed. After the sample is weighed with a co-solvent, it is placed in a porcelain boat, and the tube furnace temperature is increased to about 1300 degrees. 2 and introduced into the Ba (ClO 4) 2 solution with pH value , the reaction produces HClO 4 and BaCO 3 precipitation. Due to the increase of hydrogen ion concentration, the pH value of the solution changes. To the original value. 8X10 -3 度的电量，析出的物质为 0.5X10 -6 g 。 In the electrolysis process, each electric pulse is equivalent to 8X10 -3 degrees of electricity, and the precipitated substance is 0.5X10 -6 g .