K比例H点标准加入分光光度法同时测定铁钴镍的研究  

SIMULANEOUS SPECTROPHOTOMETRIC DETERMINATION OF IRON,COBALT AND NICKEL BY K-RATIO AND H-POINT STANDARD ADDITION METHOD

作　　者：白玲[1] 倪永年[1] 任建敏[2] 李铭芳[2] 

机构地区：[1]南昌大学化学系,江西南昌330047 [2]江西农业大学基础课部,江西南昌330045

出　　处：《南昌大学学报（理科版）》2001年第2期147-150,共4页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目 ( 2 0 0 650 0 1) ;江西省自然科学基金资助项目 ( 0 0 2 0 0 2 2 )

摘　　要：铁钴镍化学性质相似 ,常常共存于同一试样中 ,在 pH =8.7缓冲溶液中均能与试剂 4 - ( 2-吡啶偶氮 )间苯二酚 (PAR)发生显色反应 ,其吸收光谱相互重叠。以H点标准加入法为基础 ,结合K比例 (系数倍率 )法 ,对该混合体系进行了研究 ,建立了不经分离 ,直接同时测定茶叶中铁、钴、镍的新方法 。A K-ratio and H-point standard-addition method (HPSAM) for the simultaneous spectrophotometric determination of iron,cobalt and nickel is proposed.The method is based on the difference of absorption spectra of iron,cobalt and nickel forming colour complexes with 4-(2-pyridylazo)-resorcinol (PAR) in basic medium.After the standard addition,the absorbance of samples was measured:of wavelengths are 561 nm and 620 nm for iron,515.4 nm and 608 nm for cobalt,523.3 nm and 577.4 nm for nickel.The data were treated by the K-ratio and HPSAM.The method has also been applied to the determination of iron,cobalt and nickel in green tea and satisfactory results were obtained.

关 键 词：K比例H点标准加入法 铁 钴 镍 同时测定 茶叶 分光光度法 

分 类 号：O657.32[理学—分析化学] TS272.7[理学—化学]