摘要
研究发现，硼钼杂多酸能与罗丹明B形成缔合物，导致罗丹明B的荧光发生静态猝灭，以此建立了荧光猝灭测定痕量硼砂的新方法。在选定的实验条件下，当λex／λem=540／582nm，硼砂浓度在2．4～108μg／L范围内时，荧光猝灭强度与硼砂含量呈良好线性关系（r=0．9982），检出限为1．42μg／L，加标回收率在91．3％～101％之间，相对标准偏差（RSD）〈3．76％。该方法用于食品中痕量硼砂的测定，结果满意。
A rapid fluorimetric method for the determination of trace borax has been proposed, based on the ion-associate complex formed between boron molybdenum heteropoly acid and rhodamine B which can effectively quench the intrinsic fluorescence of rhodamine B. The optimum conditions of the determination were studied. The method showed good linearity in the borax concentration range of 2.4 -108 μg/L at λex/λem=540/580 nm with a correlation coefficient of 0. 9982. The detection limit for borax was 1.42 μg/L with the recovery of 91.3%~101% and RSD of 3.76%. The method has been used to determine the trace borax in food with satisfactory results.
出处
《分析科学学报》
CAS
CSCD
2008年第5期573-576,共4页
Journal of Analytical Science
关键词
硼砂
硼钼杂多酸
罗丹明B
荧光猝灭
Borax
Boron molybdenum heteropoly acid
Rhodamine B
Fluorescence quenching
