[Effects of chlorimuron-ethyl on soil microbial community structure in soybean field].

By using phospholipid fatty acids (PLFA) method, this paper studied the soil microbial community structure in the soybean fields with different chlorimuron-ethyl application history in Weihe district of Heilongjiang Province. In the meantime, the residual amount of chlorimuron-ethyl in soil was determined. There was a very low residual of chlorimuron-ethyl in soil under the conditions of different chlorimuron-ethyl application history.

Determination of 4-chloro-2-methylphenoxyacetic acid residues in wheat and soil by ultra-performance liquid chromatography/tandem mass spectrometry.

A rapid, highly sensitive, and selective method was developed for the identification and quantitation of the herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA) in wheat plants, wheat grain, and soil by ultra-performance LC/MS/MS. MCPA was extracted from the sample (5 or 10 g) with acetonitrile, and an aliquot was taken for cleanup with primary secondary amine. Two precursor product ion transitions for MCPA were measured and evaluated to provide maximum confidence in the results.

Genistein-3'-sulfonic acid dihydrate.

IN THE TITLE COMPOUND [SYSTEMATIC NAME: 5-(5,7-dihydr-oxy-4-oxo-4H-chromen-yl)-2-hydroxy-benzene-sulfonic acid dihydrate], C(15)H(10)O(8)S·2H(2)O, the benzopyran-one ring is not coplanar with the phenyl ring, the dihedral angle between them being 41.35 (3)°. No H atom was placed on the sulphonic acid group because it was not possible to distinguish between the two S=O bonds and the S-O bond.