Direct Determination of Sulfur in Rosin by Triple Quadrupole Inductively Coupled Plasma Mass Spectrometry

As single quadrupole mass spectrometry technology was difficult to completely eliminate the multi atom ion interference generated by plasma, solvent and matrix, the study mentioned by title was proposed. Anhydrous ethanol was used for direct digestion of rosin samples, which could avoid losses caused by high-temperature ashing and wet digestion. Organic injection was carried out at an additional gas oxygen flow rate of 40 mL·min^-1 to eliminate carbon deposition, and the interference from multi atom ions such as ¹⁶O⁺₂ and ³⁶ArC⁺ was removed by using triple quadrupole inductively coupled plasma mass spectrometer with dual mass filters and superior collision/reaction cell technology in oxygen mass transfer mode, achieving stable determination of sulfur in rosin. As shown by the results, linear relationship between the corresponding response intensity and mass concentration of sulfur was found within 100 μg·L^-1, with detection limit of 0.52 μg·L^-1. Seven determinations were made on standard solutions in low, medium, and high concentration levels, with RSDs of the determined values less than 4.0%. Test for recovery was made by standard addition method, giving results in the range of 91.2%-104%.