Spindle Barium Chromate Coupled with Luminol Chemiluminiscence for Determining Phosphorus and Triphenyl Phosphate

Abstract

As one kind of emerging endocrine disruptors, organophosphorus flame retardants (OPFRs) became a potential threat to human health and aroused great concern from researchers. However, the lack of efficient and portable method limited our cognition of OPFRs’ time-space distribution in water environment. In this report, a coupling chemiluminescence (CL) technique based on spindle BaCrO4 and luminol was proposed to achieve the detection of trace phosphorus and OPFRs in water samples. Through a series of optimal experiments, temperature, pH, BaCrO4 concentration and reaction time were the considerable factors in this coupling method. Furthermore, the discussion of inner mechanism demonstrated that PO43- performed a stronger binding force with Ba2+ than CrO42-, which was owned to lower solubility product constant of Ba3(PO4)2. Under the optimized conditions, the method presented a good linear relationship in the concentration range of 1-200 nM. The linear equation was I=53482.21C+1458.58 (R2=0.9995) and the limit of detection (LOD) was 0.5 nM. Further more, this proposed method was also applied to detect triphenyl phosphate (TPP) with excellent analytical performance (I=116631.5C+6462.3, R2=0.9944, LOD=0.8 nM). This report not any proposed an efficient strategy for phosphorus’ and OPFRs’ detection based on sensitive and efficient CL method, but also paved a road for the determination of inert targets and organophosphorus interferon.

Keywords: Spindle BaCrO4, Organophosphorus Flame Retardants, Endocrine Disruptors Chemiluminescence