镍(Ⅱ)-4-(2-吡啶偶氮)-间苯二酚共沉淀分离富集-原子吸收光谱法测定钢中铜  

Determination of copper in steel by flame atomic absorption spectrometry after separation and enrichment through coprecipitation in Ni(Ⅱ)-4-(2-pyridylazo)-resorcinol system

作　　者：林建梅[1] 姚俊学[1] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021

出　　处：《冶金分析》2013年第7期73-76,共4页Metallurgical Analysis

基　　金：内蒙古自然科学基金(200711020212)

摘　　要：探讨了以Ni(Ⅱ)-4-(2-吡啶偶氮)-间苯二酚共沉淀体系分离富集Cu,采用火焰原子吸收光谱(FAAS)法测定钢中Cu的方法。考察了共沉淀剂PAR加入量、共沉淀载体及其用量、溶液pH值及静置时间的影响。结果发现,在pH 4.0的条件下,加入2.0mL 4-(2-吡啶偶氮)-间苯二酚(PAR)乙醇溶液,以Ni 2+为共沉淀剂载体,能够将试样中的Cu沉淀完全。试验表明,Cu含量在0.1～10.0μg/mL范围内与吸光度呈线性关系,相关系数r=0.999 9。方法检出限为6.48μg/L。方法应用于钢标准样品35MoVALTiRE第8-2号和35MoVALTiKE第8-3号中Cu的分析,结果与认定值相符,相对标准偏差(n=6)为0.69%～0.71%。Copper was separated and enriched by coprecipitation in nickel（Ⅱ）-4-（2-pyridylazo）-resorcinol（PAR）system,then Cu in steel was determined by flame atomic absorption spectrometry（FAAS）.The effect of addition amount of coprecipitation reagent PAR,the coprecipitation carrier and its dosage,solution pH and standing time was investigated.The results showed that,Cu in sample could be completely precipitated with Ni 2＋as coprecipitation carrier after adding 2.0mL of PAR ethanol solution at pH 4.0.The experiments indicated that,the Cu content in range of 0.1-10.0μg/mL,was linear to the absorbance with correlation coefficient of r=0.999 9.The detection limit of method was 6.48μg/L.The proposed method was applied to the analysis of Cu in 35MoVALTiRE（No.8-2）and 35MoVALTiKE（No.8-3）CRMs.The results were consistent with the certified values.The relative standard deviation（RSD,n=6）was 0.69%-0.71%.

关 键 词：火焰原子吸收光谱法 4-(2-吡啶偶氮)-间苯二酚 共沉淀 镍 铜 

分 类 号：TG115.33[金属学及工艺—物理冶金] O657.31[金属学及工艺—金属学]