Adsorption Voltammetric Determination of Trace Orthophosphate in Samples of Tap Water and Nutrition

✍ Scribed by Lizeng Wang; Chengsong Ma; Xiaoli Zhang; Li Liu

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 67 KB
• Volume: 53
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1996.0033

✦ Synopsis

The voltammetric behavior of orthophosphate complex in a 0.4 mol/liter HCl-1.0 × 10 -4 mol/liter V(V)-3.0 × 10 -3 mol/liter ammonium molybdate medium is described. The complex can be adsorbed on a hanging mercury drop electrode and given a reduction peak whose peak potential is at -0.50 V (vs. standard calomel electrode). The derivative peak current is linearly proportional to the concentration for orthophosphate in the range from 1.0 × 10 -2 to 2.0 × 10 -6 mol/liter. The detection limit is 5.0 × 10 -9 mol/liter. The presence of acetone made the complex wave more stable. This sensitive and accurate method can be used to determine trace PO 4 3-in tap water and nutritional sam ples.