Dithiocarbamates chelating resins

Dithiobenzoic acid metal complexes, 2, 646 colours, 2, 646 Dithiobiuret metal complexes, 2, 640 Dithiocarbamates chelating resins mineral processing, 6,826 Dithiocarbamic acid metal complexes, 2,585 amine exchange, 1,428 photographic emulsions, 6,98 nickel poisoning, 6,768 tellurium(Il) complexes photothermography, 6,121 Dithiocarbazic acid metal complexes, 2,803 Dithiocarbimic acid metal complexes, 2,588 Dithiocarbimic acid, cyano-metal complexes, 2,808 Dithiocarboxylic acids metal complexes, 2,646 Dithiodiacetic acid metal complexes, 2, 806 Dithiodiketones... 

Fluorinated dithiocarbamates have been used as part of a supercritical fluid extraction (761), while pyrrolidene (762, 763), and benzyl (741, 764) dithiocarbamates and poly(dithiocarbamate) chelating resin (765) have also been utilized, as has detection by XRF (764) and inductively coupled plasma atomic emission spectroscopy (765). Related to this, the determination of chromium levels in urine has been achieved using lithium bis(trifluoroethyl)dithiocarba-mate as the complexing agent with detection via an isotopic dilution GC and mass spectral method (766). 

Tabushi, I., Kobuke, Y., Nakayama, N., Aoki, T., and Yashizawa, A., Chelating resin functionalized with dithiocarbamate for the recovery of uranium from seawater. Ind. Eng. Chem. Prod. Res. Dev., 1984, 23 445 148. 

Most of the instrumental methods currently available do not provide the sensitivity or freedom from matrix interferences to determine trace elements in seawater at the picomolar and nanomolar levels directly. Therefore, in most cases a pre-concentration step (and separation from the matrix for some methods) is necessary before instrumental detection. These pre-concentration steps may be selected from a wide variety of selective techniques for example, liquid-liquid extraction with chelating agents (such as dithiocarbamates), chelating cation exchange with resins (such as Chelex-100), electrochemical pre-concentration in ASV and CSV, hydride generation for the measurement of metalloids or co-precipitation with Mg(OH)2 or selected metal chelates. Some of these techniques will be discussed in more detail in conjunction with the analytical procedures outlined in Sections 12.2-12.4. 

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