论文部分内容阅读
发现了二溴苯芴酮〔4,5-二溴-2,6,7-三羟基-9-苯基氧杂蒽-3-酮〕显色剂在溴化十六烷基三甲基铵存在下,于0.2至0.6N 酸介质中与三价锑形成可溶性紫红色1:1络合物.其最大吸收波长为535nm,摩尔吸光系数7.8×10~4,桑德尔灵敏度0.0015微克/厘米~2.测定范0—10微克锑/25毫升,是分光光度测定微量锑的灵敏方法之一.普通金属离子如Mg(18毫克)、Ca(15)、Zn(25)、Mn(9)、Cu(10)、Cd(5)、Co(4)、Ni(4)、Fe(Ⅱ)(5)、Pb(0.2)、Al(10)、Bi(0.02)、Cr(Ⅲ)(0.5)、La(0.5)、Au(Ⅲ)(0.005)、Tl(Ⅰ)(2),Ag(0.05)、Ta(Ⅴ)(0.015)、W(Ⅵ)(0.003)不干扰.Fe(Ⅲ)、T1(Ⅲ)、Sn(Ⅳ)、V(Ⅴ)、Mo(Ⅵ)干扰,它们可用焦磷酶钠、硫酸羟胺、氟化物掩蔽.只有Ti(Ⅳ)干扰.一定量的阴离子:柠檬酸、酒石酸、苦杏仁酸、乳酸、草酸、磷酸根、硝酸根,氟离子、氯离子等不干扰.本法可直接在水溶液中测定,曾应用于测定铜合金、锌合金中微量锑,操作简便,分析结果准确.
Dibromobenzofluorenone [4,5-dibromo-2,6,7-trihydroxy-9-phenyloxanthen-3-one] chromogen was found to be effective in the treatment of cetyltrimethylammonium bromide In the presence of 0.2 to 0.6N acid medium to form a soluble purple complex with trivalent antimony complex having a maximum absorption wavelength of 535nm, a molar extinction coefficient of 7.8 × 10 ~ 4, a sensitivity of 0.0015 μg / cm ~ 2. Determination of 0-10 micrograms of antimony / 25 ml, is one of the sensitive spectrophotometric determination of trace amounts of antimony. Common metal ions such as Mg (18 mg), Ca (15), Zn (25), Mn (9), (0.5), Pb (0.2), Al (10), Bi (0.02), Cr (Ⅲ) , Fe (Ⅲ), La (0.5), Au (Ⅲ) (0.005), Tl (Ⅰ) 2, Ag 0.05, Ta Ⅴ, They can be masked by sodium pyrophosphate, hydroxylamine sulfate, fluoride and only Ti (Ⅳ) interfere with a certain amount of anions: citric acid, citric acid, Tartaric acid, mandelic acid, lactic acid, oxalic acid, phosphate, nitrate, fluoride, chloride, etc. This method can be directly measured in aqueous solution, has been used in the determination of copper alloy, zinc alloy trace antimony, easy to operate , The analysis result is accurate.