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Uswatul Husna
Chemistry Department, Faculty of Science and Education, Universitas Negeri Padang, Jl. Prof. Hamka, Air Tawar, Padang 25132, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics

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Kinetic Stability and Operational Optimization of Turbidimetric Sulfate Analysis Based on SNI 6989.20:2019 Methodology Uswatul Husna
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i2.485

Abstract

The measurement of sulfate (SO₄²⁻) levels using the SNI 6989.20:2019 turbidimetric method is highly dependent on the stability of the barium sulfate (BaSO₄) suspension. This study aims to evaluate the effect of waiting time (standing time) variations ranging from 5 to 35 minutes and sample container handling protocols (single vs. multi-Erlenmeyer) on the accuracy of analytical results at concentration levels of 20 mg/L and 60 mg/L. Measurements were conducted using a UV–Vis spectrophotometer at a wavelength of 420 nm. The results indicated that, at low concentrations (20 mg/L), the suspension remained relatively stable, with recovery values within the acceptable limits (90–110%) up to 35 minutes. Conversely, at high concentrations (60 mg/L), a significant decrease in recovery was observed after the 10-minute threshold, reaching 77.83% at 35 minutes due to particle sedimentation. The multi-Erlenmeyer protocol provided more accurate kinetic data compared to the single-Erlenmeyer approach, which tended to produce positively biased results due to mechanical re-suspension effects during repeated sampling.It is concluded that strict adherence to a 5-minute waiting time window is essential to ensure the validity of water quality monitoring, particularly for samples with high pollutant loads. Keywords: Sulfate, Turbidimetry, SNI 6989.20:2019, Waiting Time, Kinetic Stability
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