Determination of 24 Elements in Special Engineering Plastics by Inductively Coupled Plasma Atomic Emission Spectrometry with Super Microwave Digestion

A method for simultaneous determination of 24 elements (Al, As, Ca, Cd, Hg, Ba, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, P, Pb, Si, Sn, Se, Sb, Ti, V, Zn) in special engineering plastics, such as aromatic polysulfone (PSF), polyether ether ketone (PEEK) and polyphenylene sulfide (PPS) by inductively coupled plasma atomic emission spectrometry (ICP-AES) with super microwave digestion was proposed. The sample (0.100 g) was taken,and 5.0 mL of nitric acid, 0.5 mL of perchloric acid and 1.0 mL of hydrofluoric acid were added. The above mixture was digested in a super microwave digestion instrument with pre-added pressure of 4 MPa on the temperature program (keeping for 50 min at 280 ℃ of final temperature). After cooling, the digestion solution was taken out, and made its volume up to 50 mL with water, in which 24 elements were determined by ICP-AES. As shown by the results, linear relationships between values of the corresponding signal intensity and mass concentration of the 24 elements were found in the range of 0.020-1.000 mg·L^-1, with detection limits (3s) in the range of 0.130-5.92 mg·kg^-1. Test for recovery was made by the standard addition method, giving results in the range of 90.7%-110%, with RSDs (n=6) of the determined values less than 4.0%.