SOLVENT-EXTRACTION OF CU(I) WITH TRI-TERT-BUTOXYSILANETHIOL AND ITS APPLICATION TO PRECONCENTRATION OF COPPER FROM NATURAL-WATERS. Kasterka, B., Chojnacki, J., Wojnowski, W., & Biernat, J. F. Chemia Analityczna, 38(3):287--296, 1993.
doi  abstract   bibtex   
Extraction of Cu(I) with tri-tert-butoxysilanethiol as the extracting agent to hexane and carbon tetrachloride was investigated. HTBST is a stable compound and shows high resistivity towards hydrolysis. The distribution constant of HTBST between carbon tetrachloride and water is equal to 2.09x10(4) and the concentration protonation constant of TBST- (K(TBST)) at I=0.1 is equal to 1.41x10(8). Under the applied experiment conditions, the dominating form that is extracted to organic phase is CuTBST. Mean value of the extraction constant of CuTBST to carbon tetrachloride in the presence of chloride ions that stabilize Cu(I) in aqueous solutions by formation of CuCl(i)1-i was estimated as K(ex)BAR= 5.28x10(5) at nominal ionic strength I=1.0. Extraction of Cu(I) above pH 4.2 is practically quantitative. The process was utilized to preconcentration of copper traces from natural waters using a HTBST solution in hexane and followed by quick and direct determination of Cu(I) traces by AAS technique. Detection limit of Cu was 5ng ml-1.
@article{ kasterka_solvent-extraction_1993,
  title = {{SOLVENT-EXTRACTION} {OF} {CU(I)} {WITH} {TRI-TERT-BUTOXYSILANETHIOL} {AND} {ITS} {APPLICATION} {TO} {PRECONCENTRATION} {OF} {COPPER} {FROM} {NATURAL-WATERS}},
  volume = {38},
  issn = {0009-2223},
  doi = {<Go to ISI>://WOS:A1993LT80600003},
  abstract = {Extraction of Cu(I) with tri-tert-butoxysilanethiol as the extracting agent to hexane and carbon tetrachloride was investigated. {HTBST} is a stable compound and shows high resistivity towards hydrolysis. The distribution constant of {HTBST} between carbon tetrachloride and water is equal to 2.09x10(4) and the concentration protonation constant of {TBST-} (K({TBST))} at I=0.1 is equal to 1.41x10(8). Under the applied experiment conditions, the dominating form that is extracted to organic phase is {CuTBST.} Mean value of the extraction constant of {CuTBST} to carbon tetrachloride in the presence of chloride ions that stabilize Cu(I) in aqueous solutions by formation of {CuCl(i)1-i} was estimated as K({ex)BAR=} 5.28x10(5) at nominal ionic strength I=1.0. Extraction of Cu(I) above {pH} 4.2 is practically quantitative. The process was utilized to preconcentration of copper traces from natural waters using a {HTBST} solution in hexane and followed by quick and direct determination of Cu(I) traces by {AAS} technique. Detection limit of Cu was 5ng ml-1.},
  number = {3},
  journal = {Chemia Analityczna},
  author = {Kasterka, B. and Chojnacki, J. and Wojnowski, W. and Biernat, J. F.},
  year = {1993},
  pages = {287--296}
}

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