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激光用于吸光光度法尚属少见,我们利用氩(Ar~+)514.6nm的激光,令其通过我们试制的化学传感器对镍的测定进行了研究。镍含量在0.02～0.10μg·ml~(-1)范围内符合比耳定律,摩尔吸光系数为2.3×10~5,用于人发中痕量镍的测定,取得满意结果。 1 试验部分1.1 试剂与仪器镍标准溶液:0.1000mol·L~(-1),称取Ni(NO_3)_2·6H_2O 2.9080g溶于水中,移至100ml量瓶中定容。丁二酮肟:0.1%的乙醇溶液自制化学传感器 SP-2000型Ar~+激光器光导纤维:梯度型掺锗多模光纤,芯径85μm1.2 激光化学传感器的制作1.2.1 玻璃管和玻璃棉的处理玻璃管:取内径0.4cm的玻璃管,截约3cm长,用5%盐酸、5%氢氧化钠、纯水各洗3次后置表皿中,烘
The use of laser for absorbance spectrophotometry is still rare, we use argon (Ar ~ +) 514.6nm laser, make it through our trial of the chemical sensor for the determination of nickel. Beer’s law is obeyed in the range of 0.02 ~ 0.10μg · ml ~ (-1) and the molar extinction coefficient is 2.3 × 10 ~ 5, which is used for the determination of trace nickel in human hair. Satisfactory results were obtained. 1 Test section 1.1 Reagents and equipment Nickel standard solution: 0.1000mol · L -1, weighed Ni (NO_3) _2 · 6H_2O 2.9080g dissolved in water, transferred to a 100ml volumetric flask. Dimethylglyoxime: 0.1% ethanol solution Self-made chemical sensor SP-2000 type Ar ~ + laser Optical fiber: Gradient germanium-doped multimode fiber, core diameter 85μm1.2 Laser chemical sensor production 1.2.1 glass tube and glass wool Of the processing glass tube: take the inner diameter of 0.4cm glass tube, cut about 3cm long, with 5% hydrochloric acid, 5% sodium hydroxide, washed with water three times set the table after the dish, baking