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1

Selective solid-phase extraction of Hg(II) using silica gel surface : imprinting technique

Zheng H., Geng T., Hu L.

Chemia Analityczna

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2008

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Vol. 53, No. 5

673-687

EN

A new ion-imprinted amino-functionalized silica gel sorbent was synthesized by surface-imprinting technique for preconcentration and separation of Hg(II) prior to its determination by inductively coupled plasma optical emission spectrometry (ICP—OES). Compared to the traditional solid sorbents and non-imprinted polymer particles, the ion-imprinted polymers (IlPs) have higher adsorption capacity and selectivity for Hg(II). The maximum static adsorption capacity of the imprinted and non-imprinted sorbent for Hg(II) was 29.89 mg g-1 and 11.21 mg g-1, respectively. The highest selectivity coefficient for Hg(II) in the presence of Zn(II) exceeded 230. The detection limit (3a) of the method was 0.25 μg L-1. The relative standard deviation of the method was 2.5% for eight replicate determinations of 10 ug of Hg2+ in 200 mL-in-volume water sample. The procedure was validated byperforming the analysis of the certified river sediment sample (GBW 08603, China) using the standard addition method. The developed method was also successfully applied to the determination of trace mercury in Chinese traditional medicine and water samples with satisfactory results.

PL

Stosując technikę modyfikowania powierzchni grupami aminowymi otrzymano nowy, jonowo dopasowany żel krzemionkowy służący do zatężania i oddzielania Hg(II) przed jej oznaczeniem za pomocą optycznej spektrometrii emisyjnej ze wzbudzeniem w plazmie indukcyjnie sprzężonej (1CP—OES). W porównaniu z tradycyjnymi, stałymi sorbentami i niemodyfikowanymi polimerami, polimery dopasowane jonowo (ion-imprinted polymers - IIPs) mają większą pojemność adsorpcyjną oraz selektywność względem Hg(II). Maksymalna statyczna pojemność adsorpcyjną Hg(Il) w przypadku sorbentu modyfikowanego i niemodyfikowanego wynosiła odpowiednio 29,89 mg gg-1i 11,21 mg gg-1. Najwyższy współczynnik selekty wności Hg(lł) względem Zn(II) przekraczał 230. Granica wykrywalności (3a) wynosiła 0.25 μg L-1. Względne odchylenie standardowe, obliczone z 8 oznaczeń próbki wody zawierającej w 200 mL lO μg HgHg2+, wynosiło 2,5%. Metodę zwalidowano wykonując analizę certyfikowanych próbek osadów rzecznych (GBW 08603, Chiny) metodą dodatku wzorca. Opracowaną metodę z powodzeniem zastosowano do oznaczania śladów rtęci w tradycyjnej chińskiej medycynie oraz w próbkach wody.

2

Thermal and Structural Properties of the Hg(II) Complexes with Some Amino and Mercapto Derivatives of 1,2,4-Triazole

Gabryszewski M., Wieczorek B.

Polish Journal of Chemistry

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2006

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Vol. 80, nr 5

709-717

EN

The complexes of Hg(II) with 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 3,5-diamino- 1,2,4-triazole, 3-amino-5-methylthio-1,2,4-triazole, 1H-1,2,4-triazole-3-thiol and 3-amino-5-mercapto-1,2,4-triazole have been prepared and characterized by elemental analysis, infrared spectra and thermal analysis. The ligands form 1:2 mononuclear and 1:1 polymeric complexes. The structure and the thermal decomposition of the complexes depend on the nature of donor atoms.

3

Reactions of Complexation of Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) Ions with Adenosine 5'-Diphosphate

Łomozik L., Gąsowska A., Bregier-Jarzębowska R.

Polish Journal of Chemistry

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2004

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Vol.78 /nr 11-12

2023-2035

EN

The reaction of complexation has been studied in the systems of the ions: Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) with adenosine 5_-diphosphate. The composition and stability constants of the complexes formed have been determined by the potentiometric method. The presence of the species type: MHL, MLx, and MLOH has been confirmed and their mode of coordination has been identified on the basis of the spectral data. In the acidic solution, the coordination dichotomy N(1)/N(7) has been found in all systems studied. At pH above 7, the dichotomy does not occur in the systems with Cu(II), while in the systems with Hg(II) only phosphate groups are involved in metallation. In the synthesized solid complexes of Cd(II) with AMPor ADP, the metal ion is bound by the donor nitrogen atom N(1), and in the complexes with ATP by the nitrogen atom N(7) of the nucleotide. Moreover, in the species with adenosine di- and triphosphate, the oxygen atoms of the phosphate groups are engaged in the complexation, while in the species Cd(AMP), similarly as in the liquid phase, the phosphate group is not involved in metallation.

4

Interaction Centers of Purine and Pyrimidine Nucleotides in Their Reactions with Cu(II), Ni(II), Co(II), Cd(II) and Hg(II) Ions

Gąsowska A., Bregier-Jarzębowska R., Łomozik L.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 6

773-783

EN

It has been established that in ATP complexes with Cu(II), Co(II) and Cd(II) ions, the metallation centres are the oxygen atoms of the phosphate group and the nitrogen atom N(7) from the purine ring. The spectral data suggest some involvement of N(1) atom in these interactions. In the ATP complexes with Ni(II) the main centres of coordination were found to be N(7) and N(1), while the contribution of the oxygen atoms from the phosphate group is of secondary importance. In the ATP complexes with Hg(II) ions, above pH 7, the metallation involves only the oxygen atoms from the phosphate group, while the N(1) and N(7) atoms are outside the inner sphere of coordination. In the complexes of CTP with the metal ions studied the interaction centres are the oxygen atoms from the phosphate group and N(3) from the pyrimidine ring. However, in the case of complexes with Ni(II), the main centre of interaction is N(3), while the involvement of the oxygen atoms from the phosphate group is of minor importance.