果茶中展青霉素含量的高效液相色谱测定

An HPLC procedure is described in this paper for the determination of patulin in nectar. The method con-sists of solvent extraction and chromatographic separation,The conditions of HPLC were column; Zorbax-C_8( 5μm) at 35℃; mobile phase :AcCN/water(5/95,V/V); and detector UV275nm. The detection limit was0. 1μg/mL,the linear range was 0.5～2. 5μg and average recovery was 96.54±2.27%.     

Keggin型铜取代磷钨杂多阴离子可见光催化降解罗丹明B

以Keggin型铜取代杂多阴离子PW11O39Cu(Ⅱ)(H2O)5-[PW11Cu]为可见光催化剂,有机染料罗丹明B(RhB)为模型污染物,研究了在可见光照射下PW11Cu对RhB的可见光催化降解作用,提出了PW11Cu可见光催化作用的反应机理,同时考察了RhB初始浓度、PW11Cu初始浓度和溶液pH值对RhB光催化降解速率的影响。 实验结果表明,含有15.6 μmol/L PW11Cu+10 μmol/L RhB的水溶液在可见光照射下反应80 min,RhB的降解率达100%,总有机碳去除率约33%。 RhB的可见光催化降解服从准一级动力学方程,在RhB初始浓度为20、30和40 μmol/L的情况下,其表观一级速率常数分别为3.1×10-2、2.0×10-2和1.5×10-2 min-1。     

化妆品中四种常见防腐剂的高效液相色谱测定

An HPLC procedure is described for the determination of four preservatives,p-hydroxy benzoic esters,incosmetic products. The method consists of the preservative extraction and chromatographic separation. Theconditions of HPLC were column: μBondapak-C_(18), columntemp:45℃,mobile phase:MeOH-0.02mol/LNH_4Ac(70 ∶30,V/V),flow rate:1.0mL/min,detector UV 254nm.The results for the recovery,the detec-tion linut,the linear range and CV are good.