CoO-NiO/Al2O3催化剂中Ni含量测定方法

摘要

Spectrophotometry was applied to the determination of nickel in CoO-NiO/Al2O3 catalyst. The sample was dissolved in H3PO4-H2SO4 solution. The Ni2+ was formed to red complex with diecetyldioxime in alkaline solution(ammonium persulfate). Measurement of absorbanee was made at the wavelength of 460 nm with 3 em absorption cell The minimum detection limit of the method was 0.025 %. The proposed method was used in analyzing sample with 8 determinations. The value of RSD was 0.86 %. The values of recovery found were in the range of 95.7 % to 102.3 %.%应用分光光度法测定了CoO-NiO/Al2O3催化剂中Ni含量,试样溶于硫磷混酸中,溶液中的二价镍离子在碱性溶液中有氧化剂(过硫酸铵)存在时与丁二酮肟生成可溶性红色络合物.用3 cm比色皿,在波长460 nm处测定,方法最小检出限质量分数为0.025%.考核了方法的精密度和准确度,样品测定8次,求得测定结果的相对标准偏差为0.86%,标准加入回收率在95.7%～102.3%.