三元体系LaX_3-PIAP_H_2O(30℃,X^-=NO^-_3,Cl^-)相平衡研究

Fluorimetry determination of trace lead in aluminium alloy using enhancing effect of PVP

测定了三元体系ＬａＸ３－ＰＩＡＰ－Ｈ２Ｏ（Ｘ－＝ＮＯ－３，Ｃｌ－）在３０℃时的溶度和饱和溶液的折光率，给出了相应的溶度图和饱和溶液的折光率－组成图．这两个体系在３０℃时均为简单共饱型．

A new method of fluorimetric determination of trace amounts of lead in aluminium alloy is given. The method is based on that morin can react with lead in pH 3.43 to form an intense fluorescence, which is enhanced by the polyvingl pyrrolidone(PVP). It can raise the sensitivity of the method. The maximum excitation and emission wavelength take place at 435 nm and 444 nm respectively. The lower limit of determination is 2 1×10 -8 g/mL Pb(Ⅱ). The calibration curve is linear for 0～240 ng/mL Pb(Ⅱ). The method is used for the determination of trace lead in aluminium alloy. The results are satisfactory.