XÁC ĐỊNH HÀM LƯỢNG LƯU HUỲNH TOÀN PHẦN TRONG NÔNG SẢN VÀ SẢN PHẨM NÔNG SẢN BẰNG PHƯƠNG PHÁP KHỐI PHỔ GHÉP CẢM ỨNG PLASMA CAO TẦN (ICP-MS)

Tóm tắt

The study presents the development of a process for analyzing sulfur (S) content in agricultural products
using Inductive Coupled Plasma Mass Spectrometry (ICP-MS). This method serves to assess the quality of
agricultural products. The results of the research indicate that the ICP-MS method can determine sulfur
content (S) under optimal analysis conditions, including Helium mode, mass spectrometry 34, internal
standard Lu 0.005 ppm. Sample treatment involves acidification with 65% HNO3 and 30% H2O2 in
Microwave Prekem M3. The method demonstrates a linear regression coefficient (R2
) greater than 0.99 and
repeatability within the range of 1.46-3.92% at the limit of quantification (LOQ) value, reaching 4.89%. The
limit of detection (LOD) was found to be 5,65 mg/kg, the LOQ was 18,8 mg/kg, and the measurement
uncertainty (U) was ± (7,92 – 10,7)%.