检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:冯泳兰[1]
出 处:《岩矿测试》1999年第4期311-313,共3页Rock and Mineral Analysis
基 金:湖南省教育委员会资助
摘 要:研究了新合成的1 - (2 - 羟基- 3 ,5 - 二硝基苯基) - 3 - [ 4 - ( 苯基偶氮) 苯基] - 三氮烯( HDNPAPT) 试剂与铜的显色反应。在乳化剂OP存在下,pH11 .0 的Na2B4 O7 - NaOH 介质中,铜与HDNPAPT 形成稳定的红色配合物,其组成比为1∶2 ,λm ax = 540 n m ,表观摩尔吸光系数ε540 = 1 .73 ×105 L·mol- 1·cm - 1 ,铜的质量浓度在0 ~360 μg/ L符合比尔定律。方法应用于大米和面粉中微量铜的测定,结果与铜试剂法相符,5 次测定的RSD< 3 % 。The color reaction of new reagent 1 (2 hydroxy 3,5 dinitrophenyl) 3 (4 phenylazophenyl) triazene (HDNPAPT) with copper was studied. Results show that the color reagent reacts with Cu 2+ to form a stable red complex in the presence of emulsifier OP and Na 2B 4O 7 NaOH medium(pH=11.0). The composition of the complex is n Cu 2+ ∶ n HDNPAPT =1∶2. The maximum absorption of the complex is at 540 nm with apparent molar absorptivity of 1.73×10 5 L·mol -1 ·cm -1 . Beers law is obeyed in the range of 0~0.36 mg/L for copper. The method has been applied to the direct determination of trace copper in rice and flour samples. The results are in agreement with those provided by other method with precision of <3% RSD ( n =5).
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.222