A novel heterogeneous catalytic ozonation process in water treatment was studied,with a copper-loaded activated carbon(Cu/AC) that was prepared by an incipient wetness impregnation method at low temperature and tested as a catalyst in the ozonation of phenol and oxalic acid.Cu/AC was characterized using XRD,BET and SEM techniques.Compared with ozonation alone,the presence of Cu/AC in the ozonation processes significantly improves the degradation of phenol or oxalic acid.With the introduction of the hydroxyl radical scavenger,i.e.,turt-butanol alcohol(t-BuOH),the degradation efficiency of both phenol and oxalic acid in the Cu/AC catalyzed ozonation process decreases by 22% at 30 min.This indicates that Cu/AC accelerates ozone decomposition into certain concentration of hydroxyl radicals.The amount of Cu(Ⅱ) produced during the reaction of Cu/AC-catalyzed ozonation of phenol or oxalic acid is very small,which shows that the two processes are both heterogeneous catalytic ozonation reactions.
建立了电感耦合等离子体质谱法(ICP-MS)混合模式测定动植物源食品中11种痕量元素的检测方法。样品经微波消解后,采用混合模式测定动植物源食品中As,Hg,Pb,Cd,Cr,Co,Ni,Cu,Zn,Fe,M n 11种元素,内标法定量。结果表明:11种元素的检出限分别在0.005~0.09μg/L之间;线性关系良好,相关系数r≥0.9995;相对标准偏差(RSD)为0.94%~7.2%;回收率在90.7%~103.5%之间;对不同食品类型的对照标准样品GBW10016、GBW10018、GBW10044、GBW10051进行测定,测定结果均在参考值范围。本方法适用于批量动植物源食品中多元素的同时测定。
