1
|
Mandlate JS, Henn AS, Mello PA, Flores EMM, Barin JS, Duarte FA. Determination of Cl and S in crude oil by ICP-OES after sample digestion by microwave-induced combustion in disposable vessels. Anal Chim Acta 2023; 1273:341536. [PMID: 37423667 DOI: 10.1016/j.aca.2023.341536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 07/11/2023]
Abstract
A simple, fast and promising sample preparation method based on microwave-induced combustion in disposable vessels (MIC-DV) was developed for Cl and S determination in crude oil by inductively coupled plasma optical emission spectrometry (ICP-OES). The MIC-DV consists of a new approach of conventional microwave-induced combustion (MIC). For the combustion, crude oil was pipetted on a disk of filter paper and placed on a quartz holder, followed by the addition of igniter solution (40 μL of 10 mol L-1 NH4NO3). The quartz holder was inserted into a commercial 50 mL disposable polypropylene vessel containing the absorbing solution, which was then inserted in an aluminium rotor. The combustion occurs under atmospheric pressure in a domestic microwave oven not compromising the operator's safety. The following parameters of combustion were evaluated: type, concentration and volume of absorbing solution, sample mass and the possibility of performing consecutive combustion cycles. Using MIC-DV, up to 10 mg of crude oil were efficiently digested, using 2.5 mL of ultrapure H2O as absorbing solution. Moreover, up to 5 consecutive combustion cycles were possible without analyte losses, reaching a total sample mass of 50 mg. The MIC-DV method was validated according to Eurachem Guide recommendations. Results obtained for Cl and S by MIC-DV were in agreement with those obtained using conventional MIC, as well as those obtained for S in a certified reference material of crude oil (NIST 2721). Analyte spike recovery experiments were performed and recoveries at three concentration levels ranged from 99 to 101% for Cl and from 95 to 97% for S, indicating a good accuracy. The limit of quantification achieved by ICP-OES after MIC-DV were 73 and 50 μg g-1 for Cl and S respectively, applying 5 consecutive combustion cycles.
Collapse
Affiliation(s)
- Jaime S Mandlate
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil; Departamento de Química, Universidade Eduardo Mondlane, Maputo, P.O. Box 252, Mozambique; Centro Regional de Excelência em Estudos de Engenharia e Tecnologia de Petróleo e Gás, Universidade Eduardo Mondlane, P.O. Box 252, Mozambique
| | - Alessandra S Henn
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil; Departamento de Química, Universidade Tecnológica Federal do Paraná, 85884-000, Medianeira, Paraná, Brazil
| | - Paola A Mello
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| | - Erico M M Flores
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| | - Juliano S Barin
- Grupo 3i, Departamento de Tecnologia e Ciência dos Alimentos, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| | - Fabio A Duarte
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
| |
Collapse
|
2
|
Editorial: Nano- and Micro-Contaminants and Their Effect on the Humans and Environment. SUSTAINABILITY 2022. [DOI: 10.3390/su14106331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Nano- and ultra-fine materials have a significant influence on construction building materials, the environment, and human health [...]
Collapse
|