Synthesis Of Polystyrene N-aminothiourea Chelating Resin And Its Adsorption Of Heavy Metal Ion

Solid phase extraction(SPE) was a newly developing pre-treatment techniques of sample analysis. It is solid adsorbent to adsorb the target compound in liquid samples, so as to achieve the purpose of separation and enrichment. Polymer solid-phase extraction agent for heavy metal ions, including-NR-CS-NRR ’of nitrogen, sulfur atom could form chelates with a variety of metal ions. Therefore, polymer solid-phase extraction agent was with excellent performance of metal ions.Solid-phase extraction technology combined with inductively coupled plasma atomic emission spectrometry(ICP-AES), atomic absorption spectroscopy(AAS), etc. Thus it had an important role in the analysis of trace heavy metal ions.In this paper, polystyrene microspheres were synthesized by dispersion polymerization with styrene as monomer 1,4-dichloro methoxybutane surface modified polystyrene microspheres to obtain CMPS. And then it reacted with thiosemicarbazide to obtain solid phase extraction absorbent material containing thiosemicarbazide in the surface. The relationship was studied that the initial concentration of the monomer, initiator concentration and stabilizer concentration with size of polystyrene microspheres. With the increase of the monomer concentration, the microsphere size increases; with the increase of initiator concentration, microsphere size increases; with the increase of the concentration of the stabilizer, microsphere size decreases. Using solid phase extraction adsorbent material prepared as a solid phase extraction column filler to make of solid phase extraction column.It was conducted adsorption experiments to four kinds of metal ions Ag+, Cu2+, Pb2+ and Cr3+ in the water. Atomic absorption spectrometric determined content before and after the adsorption of heavy metal ions as well as absorbed content. The adsorption performance of prepared solid-phase extraction packing for heavy metal ions Ag+, Cu2+, Pb2+ and Cr3+ were investigated. The adsorption capacity of prepared solid-phase extraction packing for Ag+, Cu2+, Pb2+ and Cr3+ were 16.38 mg/g, 15.25 mg/g, 13.69 mg/g and 13.12 mg/g respectively. Also it was investigated the effect of the flow rate through the column and eluent on recovery, when flow rate through the column was at a flow rate 1.5 mL/min, eluent was 10 mL 5 mol/L HNO3 + 0.25 mL triethanolamine mixture, homemade small column recovery rate of Ag+, Cu2+, Pb2+ and Cr3+ respectively were 98.34%, 97.35%, 92.14%, 96.79%. At 1.0 mg/L-15.0 mg/L range, absorbance and concentration of Ag+, Cu2+, Pb2+, Cr3+ had good linear relationship. The correlation coefficient(R) were 0.9979, 0.9980, 0.9993 and 0.9979, respectively. he determination results of atomic absorption relative standard deviation(n = 10) respectively were 8.79%, 1.45%, 10.18%, 0.38%. The minimum detection limit of atomic absorption respectively were 0.026 mg/L, 0.004 mg/L, 0.031 mg/L, 0.001 mg/L.