HOÀN THIỆN PHƯƠNG PHÁP XÁC ĐỊNH NỒNG ĐỘ PERFLUOROOCTANESULFONIC ACID TRONG NƯỚC THẢI SỬ DỤNG KỸ THUẬT SẮC KÝ LỎNG KẾT HỢP KHỐI PHỔ

Tóm tắt

Perfluorooctanesulfonic acid (PFOS) and its salts are persistent organic pollutants (POPs), enumerated in
Annex B of the Stockholm Convention, which imposed restrictions on their production and utilization. This
work described the analytic procedure of PFOS in wastewater using the techniques of liquid-liquid
extraction in combination with a system of liquid chromatography coupled with a triple quadrupole mass
spectrometer (LC-MS/MS). The solvent for liquid-liquid extraction and the operation conditions (collision
energy, fragment pick, mobile phase) were completed to obtain an effective analytic procedure with a limit
of detection (LoD) of 0.5 ng/L, a limit of quantification (LoQ) of 2.0 ng/L, a relative standard deviation
(RSD) of <10%, and good reproducibility for three-time liquid-liquid extraction (the efficiency of ≥80%).
The results of PFOS analysis in two wastewater samples of the international interlaboratory comparison
program had a Z-score value of < ±1. The optimized procedure was also applied to assess five different
practical samples.