Determining uncertainty in a simple UV-Vis spectrometry method employing dimethyl carbonate as green solvent for lead determination in water

Author(s)

de Franca, Michelle Loredo ^[1] ; Separovic, Luciana ^[2] ; Junior, Luiz Sidney Longo ^[1] ; de Oliveira, Debora Cristina ^[1] ; Lourenco, Felipe Rebello ^[2] ; Calixto, Leandro Augusto ^[1]

Affiliation

^[1] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Dept Ciencias Farmaceut, Campus Diadema, BR-09972270 Diadema, SP - Brazil

^[2] Univ Sao Paulo, Fac Ciencias Farmaceut, Dept Farm, Av Prof Lineu Prestes 580 Bloco 15, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: MEASUREMENT; v. 173, MAR 2021.
• Web of Science Citations: 1

Abstract

The growth of industrial and urban centers promotes water quality issues. Water is one of the greatest sources of human exposure to lead. This study presents a simple, inexpensive, and fast analytical method for determining lead water employing DLLME followed by a UV-Vis spectrophotometer. Dimethyl carbonate (DMC) is used for the first time as the extraction solvent for lead determination. Carbonates are non-toxic, biodegradable green solvents obtained from renewable resources. For optimization, a two-level Full-Factorial Design was used; the selected conditions for 5.0-mL water analysis were DDTP 0.1%, 1.0% phosphoric acid, and 1.0 mL of DMC. This method was successfully validated through the assessment of specificity, linearity (from 0.2 to 1.0 mg L 1), accuracy (90.0% to 102.5%), precision (RSD from 2.6% to 15.0%), and LOQ of 0.2 mg L 1. Bottom-up measurement uncertainty evaluation provides relative uncertainty values around 13% to14% of lead concentration in water. (AU)

• FAPESP's process: 16/25256-6 - Determination of heavy metals in traditional herbal medicines by alternative analytical techniques employing green chemistry principles
• Grantee: Leandro Augusto Calixto
• Support Opportunities: Regular Research Grants