镀银溶液中氰化银检测方案(自动电位滴定)

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APAT-0171en京都電子工業株式会社KYOTO ELECTRONICSMANUFACTURING CO.，LTD. 4) Titrate with 0.1 mol/L sodium chloride solution. Application Note Determination of silver cyanide in silver platingsolution Industry MetalsInstrument Automatic potentiometric titratorMeasurement method Potentiometric titration / Precipitation titration Standards 1.Scope Warning ·Toxic gas and Exothermic reaction The decomposition of cyanide ion by sulfuric acid and nitric acid releases hydrogencyanide via an exothermic reaction. Decomposition operations should be performedin fume hoods， and protective masks and gloves should be worn. The concentration of silver cyanide in the plating bath greatly affects the quality of silver plating.Therefore， controlling its concentration is extremely important. The concentration of silvercyanide can be determined by decomposing the cyanide ions and titrating the silver ions producedwith a sodium chloride standard solution (Note 1). Ag++CI→AgCI This application shows an example of the determination of silver cyanide in a silver platingsolution. 2. Post-measurement procedure ·Polish the detection area of the combined silver electrode with polishing paper or other material.·Reference internal liquid (the combined silver electrode) is replaced about once every two weeks. 3.Apparatus Main unit Automatic potentiometric titrator (Preamplifier STD)Electrode Combined silver electrode (Reference internal solution1mol/Lpotassium nitrate solution) 4.Reagents Titrant 0.1mol/L Sodium chloride solutionAdditive reagents Concentrated sulfuric acid， Concentrated nitric acid 5 Procedure 1) Add exactly 10 mL of the sample into a beaker. 2) Warning (Hydrogen cyanide and Exothermic reaction) Add 20 mL of concentrated sulfuric acid and three drops of concentrated nitric acid and thengently stir to induce the reaction. 3) After the solution cools to room temperature， add 100 mL of pure water and stir until allsolids dissolve. 6.Calculation Silver cyanide (g/L)=(EP1-BL1)×TF×C1×K1/S EP1 Titration volume (mL) for sample measurement BL1 Titration volume for blank test (0 mL) F Titrant factor (1.0137) Concentration conversion coefficient (13.389) Unit conversion coefficient (1) S Amount of sample introduced (mL) 7. Example 一Parameter一 A titration mode "Automatic intermit control" used in this application note is recommended touse for slow chemical reactions such as precipitation titration. Note： The below titration parameters including "Max. Volume” in "Titr. Para" should beadjusted by the operators depending on the sample concentration. Auto Int. EP Stop Number of EP 1 End Sense Auto Gain 1 Max Volume 40 (mL) Data Sampling On Channel/Unit(Ctrl.) Ch1， mV Data sampling potential 20 (mV) Wait Time 0(s) Data sampling volume 0.5 (mL) Dose Mode None Ctrl. Speed Standard Other Control (The above condition is an example. The setting condition depends on the model.) 一 Example of titration curve - 京都电子工业株式会社-可睦电子(上海)商贸有限公司 上海市徐汇区宜山路333号1201室电话： 021-54488867 电邮： kemu-kem@163.com 网址： http：//www.kem-china.com Table 1 Measurement results of silver cyanide in silver plating solution Sample Titration Silver cyanide (mL) (mL) (g/L) 1 10 31.8950 43.29 2 10 31.9126 43.31 3 10 31.5238 42.79 Average - - 43.13 SD - 一 0.30 RSD (%) 一 - 0.69 8. Note Note 1) The cyanide ion tends to form complex with the silver ion， so it must be decomposedwith sulfuric acid and nitric acid. 京都电子工业株式会社-可睦电子(上海)商贸有限公司电话：021-54488867 电邮： kemu-kem@163.com /京都電子工業株式会社KYOTO ELECTRONICSMANUFACTURING CO.，LTD 镀银溶液中氰化银的测定 应用资料(英文版)镀银液中氰化银的浓度对镀银的质量有很大的影响。因此，控制其浓度是极其重要的。氰化银的浓度可以通过分解氰化物离子和滴定用氯化钠标准溶液产生的银离子来确定。此应用为镀银溶液中测定氰化银的一个例子。