[Pollution Levels, Sources, and Spatial Distribution of Phthalate Esters in Soils of the West Lake Scenic Area].

To investigate pollution from phthalate esters (PAEs) in the soils of the West Lake Scenic Area, Hangzhou, Zhejiang province, a total of 42 samples were collected from 4 species of soil with different uses. The concentrations and composition of 6 PAEs were analyzed by gas chromatography triple quadrupole mass spectrometry (GC-MS/MS). The sources and spatial distribution of PAEs in the different soil species were analyzed using Principal Component Analysis (PCA) and Ordinary Kriging (OK) methods.

Determination of organophosphorus pesticide residues in vegetables by an enzyme inhibition method using α-naphthyl acetate esterase extracted from wheat flour.

The widespread use of organophosphorus pesticides (OPs) poses a great threat to human health and has made the detection of OP residues in food an important task, especially in view of the fact that easy and rapid detection methods are needed. Because OPs have inhibitory effects on the activity of α-naphthyl acetate esterase (ANAE) in plants, in this work we evaluated the possibility of detecting OPs in vegetables with ANAE extracted from commercial flour. The limits of detection (LODs) obtained for methamidophos, dichlorvos, phoxim, dimethoate, and malathion in lettuce samples with crude ANAE were 0.