Ammonium pyrrolidine dithiocarbamate apdc

All vials and containers used in this study were acid washed in 10% HCl solution overnight, rinsed with deionized water and left to dry in a Class II biosafety cabinet. All reagents were of trace metal grade or better. Concentrated HNO₃ and HCl were purchased from Fisher Scientific. Deionized water (resistivity ≥ 18.2 MΩ*cm) was dispensed from our water purification system (GenPure Pro UV-TOC/UF, Thermo Scientific). Alkaline diluent solution was comprised of 0.4% (v/v) tetramethyl ammonium hydroxide (TMAH, Alfa Aesar), 1% (v/v) ethanol (Sigma-Aldrich), 0.01%(w/v) ammonium pyrrolidine dithiocarbamate (APDC, Alfa Aesar), 0.05% (v/v) Triton X-100^™ (Sigma-Aldrich). Reagent grade sodium arsenite (purity ≥90%) was purchased from Sigma Aldrich (St. Louis, MO). National Institute of Standards and Technology (NIST) traceable single and multielement stock solutions were used for preparing internal standards, and calibration standard solutions were purchased from Inorganic Ventures (Christiansburg, VA).

All vials and containers used in this study were acid washed in 10% HCl solution overnight and left to dry in a Class II biosafety cabinet equipped with positive pressure. All reagents were of trace metal grade or better. Concentrated HNO₃ and HCl were purchased from Fisher Scientific. Deionized water (resistance ≥ 18.2 MΩ*cm) was dispensed from a water purification system (Model. GenPure Pro UV-TOC/UF, Thermo Scientific). Alkaline diluent solution was comprised of 0.4% (v/v) tetramethyl ammonium hydroxide (TMAH, Alfa Aesar), 1% (v/v) ethanol (Sigma-Aldrich), 0.01%(w/v) ammonium pyrrolidine dithiocarbamate (APDC, Alfa Aesar), 0.05% (v/v) Triton X-100™ (Sigma-Aldrich). National Institute of Standards and Technology (NIST) traceable single and multielement stock solutions were used for preparing internal standards, and calibration standard solutions were purchased from Inorganic Ventures (Christiansburg, VA).