【摘要】 合成了荧光试剂水杨醛缩氨基硫脲 (SHTA) ,该试剂与碱土金属 (Be ,Mg ,Ca ,Sr,Ba)离子能形成配合物 ,从而使该试剂在λex/λem=385 /485nm ,产生荧光熄灭 ,其熄灭的程度随碱土金属离子半径的减小而增大。利用此配合反应建立了铍的分析方法 ,铍量在 0～ 32 μg/L范围内与ΔIF 成线性关系 ,检测限为 0 .2 5μg/L ,相对标准偏差为 1 .6% ,考察了 30余种共存组分的干扰情况。方法应用于测定人发和矿泉水中的痕量铍 ,回收率分别为 98.9%和 1 0 7%。更多还原

【Abstract】 A fluorescent reagent salicylaldehyde hydrazinecarbothioamide was synthesized. This reagent exhibited a fluorescent excitation and emission maxima at 385 nm and 485 nm, respectively. In the pH 9.3 buffer solution, this reagent formed complexes with beryllium, magnesium, calcium, strontium and barium, respectively, and caused its fluorescence quenching. The less the ionic radium of alkali earth metals, the greater their fluorescence quenching intensities. Based on this, a new method for determination of beryllium was proposed. The linear range of the method was from 0.0 to 32 μg/L of Be with detection limit of 0.25 μg/L. The relative standard deviation was 1.6%. Interferences of other ions were studied. The method was successfully applied to the determination of beryllium in human′s hair and mineral water with recoveries of 98.9 % and 107 %, respectively.更多还原