Determination of Trace Bismuth by a Solid Substrate Room Temperature Phosphorescence Quenching Method Based on Anionic Polymeric Acryclic Acid Lead Particles Containing Luminescent Eosine Molecules

Abstract

Luminescent particles of Anionic Polymeric Acryclic Acid Lead (Pb(PAA)₂) which containing eosine(HFInBr₄), Eosine nanomicroball of anionic polypropylene acid lead contained luminophores (short for E.N.PAA.L.C.L), were synthesized by a sol‐gel method, using anionic polymeric acryclic acid sodium (PAANa) as the precursor and Pb²⁺ as the precipitant. NH₄Ac‐HAc can react with the Pb²⁺ in E.N.PAA.L.C.L, causing it to decompose into aqueous soluble components. E.N.PAA.L.C.L‐ NH₄Ac‐HAc can emit strong and stable solid substrate room temperature phosphorescence (SS‐RTP) on filter paper, and bismuth, mercury or iodine can cause a decrease in phosphorescence intensity. Based on the facts above, a new method for the determination of trace bismuth by an SS‐RTP quenching method was established. The linear range of this method was 0.01–0.20(pg spot^?1) (4.0×10^?12 g ml^?1) of Bi³⁺, with a detection limit (LD) of 0.0016 pg spot^?1, and the regression equation of the working curve was ΔIp=61.01+237.8 m_Bi3+ (pg spot^?1), r=0.9992. This method was applied to the determination of trace bismuth in human hair and well water samples with satisfactory results. The mechanism of SS‐RTP emission was also discussed.