Sulfur compounds in the diesel were selectively derived into methylsulfonium salts by reacting with iodomethane in the presence of silver tetrafluoroborate, and characterized by positive-ion electrospray ionization (ESI) fourier transform ion cyclotron resonance (FT-ICR MS). The conversion ratios and react selectivities of the methylation for various sulfur compounds were investigated by gas chromatograph coupled with pulse flame photometric detector (GC-PFPD). Result shows that the sulfur compounds in the diesel can react with iodomethane easily at room temperature, the most of sulfur compound derived into methylsulfonium salts;the homologue of benzothiophene get the higher conversion ratio and react selectivity than the homologue of dibenzothiophene (DBT). It is found that primarily sterically hindered alkylated DBT, for example, 4- or 4-, 6- DBT, is recalcitrant to be methylated. Other than benzothiophenes and dibenzothiophenes, one- and two-ring sulfides, as well as other sulfur compounds with a double bond equivalent (DBE) value ranged from 1 to 12 are identified in the diesel.

【Objective】 To explore the correlation of DAT-positive hemolytic anemia(HA) with gender, age, and ABO serological indicators (anti-A, anti-B, anti-AB, anti-D; Ac, Bc, Oc), so as to provide references for clinical diagnosis. 【Methods】 2 832 HA patients who had underwent DAT tests in the Second Affiliated Hospital of Xi′an Jiaotong University in recent years were divided into the positive-DAT patients ( n=382 )and negative-DAT patients (n=2 450 ) according to the testing results. The correlation between the positive-DAT patients and the sex, age and ABO serological indicators was analyzed using SPSS 25.0 statistical software. 【Results】 DAT-positive HA risk in women were significantly higher than men (OR=1.712, CI95%= [1.365, 2.147], P<0.01), and it differed significantly by ages; it increased significantly with the presence of positive anti-A, negative Ac (OR=1.429, CI95%= [1.150, 1.775] ; P<0.01), and positive Oc(OR=21.369, CI95%= [13.813, 33.057] ; P<0.01). Men aged 31~40 were prone to develop mixed type(OR=19.304, CI95%= [2.208, 168.751] ; P<0.01), women aged 41~50 were prone to cold antibody(OR=3.981, CI95%= [1.545, 10.259] ; P<0.01); anti-AB positive patients were prone to mixed type (OR=1.852, CI95%= [1.027, 3.339] ; P<0.05), Oc positive was prone to warm antibody(OR=4.018, CI95%= [1.386, 1.646], P<0.01). 【Conclusion】 DAT-positive HA is significantly correlated with gender and age, and is positively correlated with anti-A, Oc positive and Ac negative.