Determination of bioavailable lead in atmospheric aerosols using unmodified screen-printed carbon electrodes

Autor(es)

Silva-Neto, Habdias de A. ^[1] ; Cardoso, Thiago M. G. ^[1] ; Coltro, Wendell K. T. ^[1] ; Urban, Roberta C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Goias, Inst Quim, BR-74690900 Goiania, Go - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, Environm Biogeochem Lab LBGqA, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYTICAL METHODS; v. 11, n. 38, p. 4875-4881, OCT 14 2019.
• Citações Web of Science: 0

Resumo

Atmospheric aerosol or particulate matter (PM) has huge potential to affect health and climate. The adverse effects of particulate matter exposure on human health depend on its size and composition, and toxic metals, such as lead, are some of the constituents. Conventional methods to detect lead include atomic absorption and flame emission spectroscopy, which require high cost and bulky instrumentation, generate noticeable amounts of residues and need trained technicians or users. In this study, a simple, portable and low-cost electrochemical method is reported to determine bioavailable lead in PM using an unmodified screen-printed carbon electrode (SPCE) based on square wave anodic stripping voltammetry performed on a portable potentiostat. The proposed approach has provided excellent sensitivity (21 +/- 1 mu A mg(-1) L) with a detection limit of 0.023 mu g L-1, low interference from other metals and a recovery of ca. 90%. The accuracy of the method was confirmed by comparison with inductively coupled plasma mass spectrometry. Moreover, the use of the SPCE exhibited good stability allowing quantification of lead in atmospheric PM collected in Goiania city (2016). The achieved concentrations of lead ranged from 0.04 to 0.21 ng m(-3). Based on the reported data, the unmodified SPCE device has successfully demonstrated great selectivity and sensitivity for environmental analysis at trace levels, making possible the monitoring of bioavailable lead in PM samples. (AU)

• Processo FAPESP: 18/04820-6 - Composição química da atmosfera na mesorregião de Araraquara e seu impacto na saúde
• Beneficiário: Roberta Cerasi Urban
• Modalidade de apoio: Auxílio à Pesquisa - Regular