排序方式: 共有36条查询结果,搜索用时 15 毫秒
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研究了氯化钠存在下硫氰酸铵-溴化十六烷基吡啶-水体系浮选分离Hg(Ⅱ)的行为及其与常见离子分离的条件。结果表明:pH 5.0,在1.0 g氯化钠存在下,当0.1 mol.L-1硫氰酸铵溶液0.5 mL,1.0×10-2mol.L-1溴化十六烷基吡啶溶液1.0 mL时,Hg(Ⅱ)可被此体系定量浮选,而Cd(Ⅱ)、Ni(Ⅱ)、Co(Ⅱ)、Mn(Ⅱ)、Fe(Ⅱ)、Al(Ⅲ)等离子在此体系中不被浮选,从而实现了Hg(Ⅱ)与这些常见离子之间的定量分离,对合成水样中微量Hg(Ⅱ)进行的定量浮选分离测定,测得平均回收率为100.5%。 相似文献
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板蓝根颗粒中蔗糖含量的红外光谱法测定 总被引:1,自引:0,他引:1
A method for rapid quantitative determination of sucrose in isatis-root granules by Fourier Transform Infrared Spectrophotometry(FTIR) was developed. Potassium ferricyanide was chosen as an inside mark material because it has only one strong absorption peak at 2117cm-1 and the peak was chosen as its quantitative peak. The peak at 1283cm-1 is the characteristic absorption of sucrose and was chosen as the quantitative peak of sucrose. The ratio of the two absorbances is I=Ai/As.K3[Fe(CN)6] and sucrose were mixed according to a certain mass ratio m=mi/ms to prepare standard samples. The curve of m versus I is the quantitative working curve. The linear range for sucrose is 5.0~23.0mg/g,the recovery is in the range of 91%~103%,the relative standard deviation is less than 5%. 相似文献
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卡托普利分子中的巯基(-SH)能还原三价铁至二价状态,试验发现铁(Ⅲ)与钛铁试剂络合物的色泽由于卡托普利的存在而出现消褪。确定了铁(Ⅲ)与钛铁试剂的反应条件:于25mL的容量瓶中依次加入0.250 0g·L-1铁(Ⅲ)溶液2.20mL,6.25g·L-1钛铁试剂溶液0.6mL及pH 3.0Clark-Lubs缓冲溶液10.0mL,加水定容,于80℃水浴中加热20min使显色完全。在其吸收峰670nm处测量吸光度A1。在此反应体系中加入不同浓度的卡托普利标准溶液,按相同步骤操作并测得其吸光度A2,结果表明:A1与A2之差(ΔA)与卡托普利的质量浓度在0.012~0.036g·L-1范围内呈线性关系。将此方法应用于卡托普利片剂中卡托普利含量的测定,所得测定值与用药典法测定的结果相符。 相似文献
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硝酸钠-硫氰酸铵-十六烷基三甲基氯化铵-水体系浮选分离铅(Ⅱ) 总被引:5,自引:0,他引:5
硝酸钠-硫氰酸铵-十六烷基三甲基氯化铵-水体系浮选分离铅(Ⅱ) 相似文献