Characteristics, sources and health risk assessment of trace metals and polycyclic aromatic hydrocarbons in PM from Hefei, China.

Trace metals (TRs) and polycyclic aromatic hydrocarbons (PAHs) are major toxic components of fine particulate matter (PM) and related to various health adverse outcomes. The study aims to get a better understanding of the contents, sources and risks of PM-bounded TRs and PAHs in Hefei, China, during the period of 2019-2021. We collected 504 samples and measured twelve TRs and sixteen priority PAHs by inductively coupled plasma mass spectrometry and high-performance liquid chromatography.

[Simultaneous spectrophotometric determination of certain beta-lactam antibiotics in rabbit serum using multivariate calibration methods].

Cefuroxime sodium, ceftriaxone sodium, cefotaxime sodium and cefazolin sodium have absorption in ultraviolet region, and their absorption spectra are overlapping. So they can not be determined individually by spectrophotometry without prior separation. In this paper, the chemometric multivariate calibration method was applied to the simultaneous determination of these four compounds in a Britton-Robinson buffer solution (pH 2.