摘要
报道了用钨灯、滤光片、光电二极管自制的一种光电探头。应用于ＥＤＴＡ滴定钙镁时，该探头能灵敏地响应酸性铬蓝Ｋ萘酚绿Ｂ混合指示剂的颜色变化，从而实现了自动光度滴定。方法已用于磷灰石中钙镁的测定，取得了满意的结果。
In this paper, a home made photometric probe, which is made up of a tungsten lamp, filter and a silicon photodiode, is reported. The photometric probe is sensitive to the color change of acid chrome K and naphthol green B mixed indicator when Ca 2+ and Mg 2+ are titrated with EDTA. With this probe, an autophotometric titration method is developed and has been applied to the determination of calcium and magnesium in apatite with satisfactory results.
关键词
光度探头
光度滴定
光学仪器
photometric probe, photometric titration, determination of calcium and magnesium
