摘要
在pH5.37的HAc-NaAc介质中,在酒石酸钠钾和苯羟乙酸的存在下,meso-[四-(对-三甲铵基)苯基]卟啉与Bi(Ⅲ)在室温下反应10min形成Bi(Ⅲ)∶TAPP=1∶2的络合物.络合物的最大吸收在463nm,摩尔吸光系数为1.0×105mol-1·L·cm-1,Bi(Ⅲ)在0~16μg/25ml内符合比耳定律,对测定5μg/25mlBi(Ⅲ)而言,共存离子允许量(μg)为:NO-3(1200),Cl-(200),Al3+(80),Au3+(15),Fe3+(200),Fe2+(150),Mg2+(30),Mo(Ⅳ)(10),Ni2+(15),Pb2+(15),Zn2+(5),Ti(Ⅳ)(20),不干扰测定,Ag+,Co2+,Cd2+,Cu2+,Cr(Ⅴ),Hg2+,Zr(Ⅳ)严重干扰.该方法已用于药物中铋的含量测定.
In the medium of pH 5.37 acetate buffer solution, the complex of bismuth with meso tetrakis [4 (trimethyammoniumy)phenyl]porphyrin(TAPP)can be formed in the presence of both catalysts of hydroxy pnenyl acetic acid and tartrate at room temperature about 10 min. The maximum absorbance is measured at 463 nm with the apparent absorption of 1.0 ×10 5 L·mol -1 ·cm -1 . The molar ration of Bi∶TAPP is 1∶2. Beers law is followed when bismuth is in the range of 0~16 μg/25 ml. The amounts of interfering ions for 5 μg Bi(Ⅲ) /25 ml are :NO - 3(1200 μg), Cl -(200 μg), Al 3+ (80 μg), Au 3+ (15 μg), Fe 3+ (200 μg), Fe 2+ (150 μg). The ions of Ag +, Cu 2+ , Co 2+ , Cd 2+ , Cr(V), Hg 2+ , Zr(Ⅳ), Sn 4+ seriously interfere the determination of bismuth. The method is used in the determiniaction of bismuth in the drugs.
出处
《兰州大学学报(自然科学版)》
CAS
CSCD
北大核心
1999年第1期126-129,共4页
Journal of Lanzhou University(Natural Sciences)
基金
河南省自然科学基金