| 分光光度法测定化学试剂中痕量钙 |
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| 引用本文： | 翟庆洲,耿爱芳,王巍,胡伟华.分光光度法测定化学试剂中痕量钙[J].化学研究,2004,15(1):30-32. |
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| 作者姓名： | 翟庆洲 耿爱芳 王巍 胡伟华 |
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| 作者单位： | 长春理工大学西校区,纳米技术研究中心,吉林,长春,130022;长春理工大学西校区,纳米技术研究中心,吉林,长春,130022;长春理工大学西校区,纳米技术研究中心,吉林,长春,130022;长春理工大学西校区,纳米技术研究中心,吉林,长春,130022 |
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| 摘 要： | 在pH10.4的NH3 NH4Cl介质中,Ca2+与DBC 偶氮氯膦生成1∶1蓝色络合物.络合物的最大吸收波长位于624nm,方法的表观摩尔吸光系数ε624nm=3.82×104L·mol-1·cm-1,钙量在0～25μg/25mL范围内遵守比尔定律.本法用于化学试剂KCl,NaCl及NaNO3中痕量钙的测定,得到了满意的结果.
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| 关 键 词： | 分光光度法 钙 DBC-偶氮氯膦 化学试剂 |
| 文章编号： | 1008-1011(2004)01-0030-03 |
| 修稿时间： | 2003年9月8日 |
Determination of Trace Calcium in Chemical Reagents by Spectrophotometry |
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| ZHAI Qing-zhou,GENG Ai-fang,WANG Wei,HU Wei-hua.Determination of Trace Calcium in Chemical Reagents by Spectrophotometry[J].Chemical Research,2004,15(1):30-32. |
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| Authors: | ZHAI Qing-zhou GENG Ai-fang WANG Wei HU Wei-hua |
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| Abstract: | A new method was developed for the determination of trace calcium using DBC-chlorophosphonazo as a colour reagent. In the medium of NH_(3)-NH_(4)Cl buffer medium at pH 10.4, calcium(Ⅱ) and DBC-chlorophosphonazo form a blue complex with molar ratio of 1∶1. The apparent molar absorptivity ε _(624 nm )= 3.82×10~(4) L·mol~(-1)·cm~(-1). Beer's is obeyed over the range of 0～25μg/25 mL of calcium. The method has been used in the determination of trace calcium in potassium chloride, sodium chloride and sodium nitrate chemical reagents. The results obtained were satisfactory. |
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| Keywords: | spectrophotometry calcium DBC-chlorophosphonazo chemical reagent |
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