共查询到18条相似文献,搜索用时 78 毫秒
1.
2.
一阶导数差示脉冲极谱法用于扑热息痛的定量分析 总被引:2,自引:1,他引:2
一阶导数差示脉冲极谱法用于扑热息痛及其制剂的定量分析,在乙醇-水-2.0×10^-^3mol/LH2SO4(12.5:11.5:1)的溶液中,于0.24V(usAg/AgCl)处出现良好的一阶导数差示脉冲极谱峰,在3.3×10^-^4~3.3×10^-^3mol/L范围内,浓度与其一阶导数差示脉冲极谱峰值呈线性关系,检测限为7.8×10^-^8mol/L。方法简便,快速,灵敏,结果准确。 相似文献
3.
4.
磺胺甲恶唑的二阶导数差示脉冲极谱法测定 总被引:3,自引:0,他引:3
建立了磺胺甲恶唑的二阶导数差示脉冲极谱定量分析方法,磺胺甲恶唑在10%HCl-(硼酸-氯化钾缓冲溶液)-水(5:5:90)的底液中,于-1.45V(vs.Ag/AgCl)处出现一良好的二阶导数差示脉冲极谱峰,磺胺甲恶唑浓度与其峰高在0.08~0.80mmol/L范围内呈线性关系(p〈0.01),检测限为8.6nmol/L。本法简便、快速、灵敏、结果准确。 相似文献
5.
6.
7.
8.
9.
牡丹皮中丹皮酚的二阶导数差示脉冲极谱法定量研究 总被引:1,自引:1,他引:0
建立了中草药牡丹皮中丹皮酚的二阶导数差示脉冲极谱定量分析方法。丹皮酚在1mmol/L-1mmol/L氯化钾-水(1:1:23)的溶液中,于-1.6.30V(s ag/AgCl)处出现一良好的二阶导数差示脉冲极谱峰,其峰幅值与丹皮酚在0.1~0.6mmol/L范围内呈非常显著的线性关系(P〈0.01),检测限为9.2mmol/L。本法简便、快速、灵敏,且结果准确。 相似文献
10.
11.
本实验运用一阶导数差示脉冲极谱法对甲硝唑及其制剂进行了定量研究。在0.001mol/L氯化钾-0.001mol/L盐酸-水(1+0.2+48)的底液中,甲硝唑于-0.800V(vs Ag/AgCl)处出现一良好的一阶导数差示脉冲极谱峰,在50~300μg/mL范围内,药物浓度与其导数峰幅值呈线关系,检测限为8.0×10^-8mol/L。本法操作简便,快速,灵敏,结果准确。 相似文献
12.
磺胺二甲嘧啶钠的二阶导数差示脉冲极谱法定量研究 总被引:2,自引:0,他引:2
建立了磺酸二甲嘧啶钠的二阶导数差示脉冲极谱定量分析方法,磺胺二甲嘧啶钠在乙醇-(硼酸-氯化钾缓冲液)-水(体积比70:2:28)的底液中,于-1.560V(vs.Ag/AgCl)处出现一良好的二阶导数差示脉冲极谱峰,磺胺二甲嘧啶钠浓度与其峰幅值在0.06~0.6mmol.L^-1范围内呈非常显著的线性关系(P〈0.01),检出限为9.2nmol.L^-1,已用于注射液中磺酸二甲嘧啶钠的测定。 相似文献
13.
14.
《Analytical letters》2012,45(1):56-65
Abstract The electrochemical methods, sampled direct current, and differential pulse polarography, were developed successfully and applied to the routine determination of Entacapone in pharmaceutical formulation. Both methods gave rise to three reduction waves or peaks respectively. The irreversibility and the diffusion‐controlled of the first reduction were confirmed by cyclic voltammetry. The limiting currents are directly proportional to the concentration of entacapone with a correlation coefficient of 0.99. The within‐day coefficients of variation and the day‐to‐day coefficient of variation were less than 3.5% for entacapone and Comtan®. The percentage recovery for entacapone in tablets is satisfactory for both methods. The method is simple without any pretreatment. 相似文献
15.
16.
《Analytical letters》2012,45(17):1411-1422
Abstract A previously reported method for the determination of nitrite ion has been extended to include nitrate ion. Nitrate is reduced to nitrite by a cadmium column and the nitrite ion determined as diphenylnitrosamine. Cadmium interference is removed by pH adjustment and the use of KDTA. 相似文献
17.
《Analytical letters》2012,45(5):1049-1064
ABSTRACT The electrochemical determination of chloramphenicol (CAP) in food using mini- and micro- mercury drop electrodes and differential pulse polarography (DPP) has been elaborated. A phosphate buffer with pH 6.6 was used as the basic electrolyte. The analysis was based on a peak at the potential Ep = ?0.320 V which showed a clearly linear dependence of the peak current on the concentration of chloramphenicol in the sample under investigation. Prior to the determination of chloramphenicol in actual samples it was necessary to extract this antibiotic with organic solvents such as methanol, ethanol and ethyl acetate. In order to separate CAP in its basic form, various modifications of sample preparation procedures were made for the analysis with the use of selected hydrolytic enzymes. The determined quantities of CAP in the samples of meat, milk, eggs and their products ranged in the ng/g d.w. range. For purposes of comparison and verification of the electrochemical results of CAP determination, chloramphenicol was determined in the same samples, by the immunoenzymatic method ELISA. 相似文献
18.
MENG Qing-fan TENG Le-sheng JIANG Chao-jun An Jin-shuang LI Lei LU Jia-hui TENG Li-rong 《高等学校化学研究》2008,24(1):29-31
A novel method for the determination of vitamin C(Vc) is proposed in this article. After the reaction with Folin-Ciocalteau reagent at ambient temperature, Vc solution was scanned at 750--1100 nm, and its first-order derivative spectrum were obtained from the original spectrum. The values of derivative selected at 995 nm were used for determination. It was proved that Vc could quickly react with Folin-Ciocalteau reagent within 5 min and the product was quite stable for a long time. The conditions required for this method is not very complicated, its precision and accuracy are similar to those of the iodometric titration described in Chinese Pharmacopoeia, and the limit of detection is 0.312 μg/mL. The determination of the results of vitamin C tablet, pill, and injection demonstrates that this method has wide pharmaceutical applications. 相似文献