Matrix Effect Assessment of an Ion Chromatographic Method to Determine Inorganic Anions in Wastewater

Author(s)

Costa, Rachel B. ^[1] ; Camiloti, Priscila R. ^[1] ; Sabatini, Carolina A. ^[1] ; dos Santos, Carla E. D. ^[1] ; Lima Gomes, Paulo C. F. ^[2] ; Adorno, Maria Angela T. ^[1]

Affiliation

^[1] Univ Sao Paulo EESC USP, Sao Carlos Sch Engn, Ctr Res Dev & Innovat Environm, Lab Biol Proc, Ave Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil

^[2] Sao Paulo State Univ, Dept Analyt Chem, UNESP, BR-14800970 Araraquara, SP - Brazil

• Document type: Journal article
• Source: WATER AIR AND SOIL POLLUTION; v. 229, n. 7 JUL 2018.
• Web of Science Citations: 2

Abstract

Inorganic anion monitoring is essential for bioreactor operation and is related for pollution control or energy and products recovery. However, there is a lack of studies validating methods for inorganic anions analyses in conditions compatible to those in bioreactor operations treating different types of wastewater. This paper provides a systematic statistical study and matrix-effect assessment for sugarcane vinasse, leachate, sewage and synthetic sewage. Sample preparation consisted of only a filtration and sample dilution. Cl-, NO2 (-), NO3 (-), PO4 (3-) and SO4 (2-) were determined in a Dionex ICS 5000A (R) equipped with a chemical conductivity suppressor. Calibration curves were linear and well-adjusted between 2.5 and 50 mg L-1 for all the anions in all the tested matrices, except PO4 (3-) and SO4 (2-) in vinasse. A calibration range for PO4 (3-) in all tested matrices was 5.0 to 100 mg L-1, whereas a range from 5.0 mg L-1 to 50 mg L-1 was obtained for SO4 (2-) in vinasse. All the anions yielded recoveries in the range of 85-115% for all the tested matrices. Relative standard deviations lower than 10 and 2% were achieved for peak areas and retention times, respectively. A signal enhancement was observed for all the tested matrices and all the anions. The matrix effect level varied from -1.7 (NO2 (-) in vinasse) to -33.9% (Cl- in leachate). Sewage was the less affected matrix, while leachate gave higher matrix effects. Validation results and the matrix effect assessment showed that a simple sample preparation is suitable for multi-elemental analyses of inorganic anions for complex environmental samples. (AU)

• FAPESP's process: 09/15984-0 - Bioenergy production from wastewaters and environmental fitting of liquid and solid wastes generated
• Grantee: Marcelo Zaiat
• Support Opportunities: Research Projects - Thematic Grants