Tetrachloroauric iii acid trihydrate haucl4 3h2o

Tetrachloroauric (III) acid trihydrate (HAuCl₄ 3H₂O, Sigma-Aldrich, St. Louis, MO, USA), trisodium citrate (Na₃C₆H₅O₇, Sigma-Aldrich, St. Louis, MO, USA), and GO (Graphene Supermarket, Calverton, NY, USA) were used as purchased. Bst DNA polymerase, 10X of ThermoPol buffer, 100 mM magnesium sulfate (MgSO₄), and 10 mM dNTP were obtained from New England BioLabs (Ipswich, MA, USA). SYBR green I fluorescent nucleic acid was purchased from LONZA (Rockland, ME, USA). Ultrapure water was used throughout this study.

Tetrachloroauric (III) acid trihydrate (HAuCl₄·3H₂O), BPA, HCl, NaOH, Na₂HPO₄, NaH₂PO₄, and all interference compounds were purchased from Sigma-Aldrich. Carboxylated multi-walled carbon nanotubes were acquired from Orion High Technologies S.L. Screen-printed carbon (DRP-110) (φ~0.13 cm²) and glassy carbon electrodes (φ~0.07 cm²) were purchased from DropSens and CH Instruments Inc., respectively. SPCE consisted of a three-electrode system, in which working (4 mm diameter) and counter electrodes are made of carbon and the pseudo-reference electrode is Ag/AgCl. For experiments with GCEs, a platinum wire was used as the counter electrode, meanwhile, an Ag/AgCl (3M KCl) electrode was used as the reference electrode.
Commercial water samples were acquired from local markets and tap water from local suppliers. Carboxylated CNTs (10 mg) were dispersed in 10 ml of water and subjected to sonication for one hour. Before using, CNT solution was sonicated for 1 min. Then, gold nanoparticle precursor solution was obtained dissolving HAuCl₄·3H₂O in double-distilled water at a concentration of 3 mM. Both solutions were conserved in the fridge at 4 °C before use.

Analytical grade Tetrachloroauric (III) acid trihydrate (HAuCl₄·3H₂O) was purchased from Sigma-Aldrich Co. (St Louis, MO, USA). Plants were purchased from the local market in Türkiye and used after the biological identification by a plant taxonomist at the Department of Botany, Erciyes University, Turkey.