An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction ...An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction and zinc precipitation were evaluated.The single-factor experimental results showed that the removal rates of Zn2+and24SO?decreased with an increased ZPT concentration ranging from3.0to5.0mg/L.Zn2+and24SO?in wastewater were effectively removed under the conditions of30?35°C,pH7?8and an inoculum concentration of10%?25%.The presence of Fe0in the SRB system enhanced Zn2+and24SO?removal and may increase the resistance of SRB to the toxicity of Zn2+and ZPT in wastewater.A Box?Behnken design was used to evaluate the influence of the main operating parameters on the removal rate of24SO?.The optimum parameter values were found to be pH7.45,33.61°C and ZPT concentration of0.62mg/L,and the removal rate of24SO?reached a maximum of91.62%under these optimum conditions.展开更多
建立了同时测定化妆品中8种防腐剂的高效液相色谱方法。对不同基质类型的化妆品样品加入溶剂超声提取,提取液经高速离心处理,上清液以正己烷脱脂,经0.22μm微孔滤膜过滤后取续滤液,色谱柱为Exmere Avanti BDS Quattro (4.6 mm×250 ...建立了同时测定化妆品中8种防腐剂的高效液相色谱方法。对不同基质类型的化妆品样品加入溶剂超声提取,提取液经高速离心处理,上清液以正己烷脱脂,经0.22μm微孔滤膜过滤后取续滤液,色谱柱为Exmere Avanti BDS Quattro (4.6 mm×250 mm×5μm),流动相为质量分数0.1%三氟乙酸水溶液-乙腈,梯度洗脱,流速为1.0 m L/min,柱温为30℃,进样量10μL,经高效液相色谱-二极管阵列检测器测定,外标法定量。结果发现,8种防腐剂在一定浓度范围内呈良好线性关系(相关系数均大于0.9999);回收率(n=6)在88.0%~120.1%,相对标准偏差小于6.9%,化合物十二烷基三甲基溴化铵(DTAC)的最低检出质量比为150μg/g,化合物吡硫鎓锌、己脒定、氯己定的最低检出质量比为10μg/g,其余化合物的最低检出质量比为40μg/g。该方法灵敏度高,重复性好,操作简单,填补了《化妆品安全技术规范》(2015年版)中的监管空白,有利于规范化妆品行业对该类防腐剂的使用。展开更多
基金Project(2015DFG92750)supported by the International S&T Cooperation Program of ChinaProjects(51278464,51478172)supported by the National Natural Science Foundation of ChinaProject(2014GK1012)supported by the Department of Science and Technology of Hunan Province,China
文摘An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction and zinc precipitation were evaluated.The single-factor experimental results showed that the removal rates of Zn2+and24SO?decreased with an increased ZPT concentration ranging from3.0to5.0mg/L.Zn2+and24SO?in wastewater were effectively removed under the conditions of30?35°C,pH7?8and an inoculum concentration of10%?25%.The presence of Fe0in the SRB system enhanced Zn2+and24SO?removal and may increase the resistance of SRB to the toxicity of Zn2+and ZPT in wastewater.A Box?Behnken design was used to evaluate the influence of the main operating parameters on the removal rate of24SO?.The optimum parameter values were found to be pH7.45,33.61°C and ZPT concentration of0.62mg/L,and the removal rate of24SO?reached a maximum of91.62%under these optimum conditions.
文摘建立了同时测定化妆品中8种防腐剂的高效液相色谱方法。对不同基质类型的化妆品样品加入溶剂超声提取,提取液经高速离心处理,上清液以正己烷脱脂,经0.22μm微孔滤膜过滤后取续滤液,色谱柱为Exmere Avanti BDS Quattro (4.6 mm×250 mm×5μm),流动相为质量分数0.1%三氟乙酸水溶液-乙腈,梯度洗脱,流速为1.0 m L/min,柱温为30℃,进样量10μL,经高效液相色谱-二极管阵列检测器测定,外标法定量。结果发现,8种防腐剂在一定浓度范围内呈良好线性关系(相关系数均大于0.9999);回收率(n=6)在88.0%~120.1%,相对标准偏差小于6.9%,化合物十二烷基三甲基溴化铵(DTAC)的最低检出质量比为150μg/g,化合物吡硫鎓锌、己脒定、氯己定的最低检出质量比为10μg/g,其余化合物的最低检出质量比为40μg/g。该方法灵敏度高,重复性好,操作简单,填补了《化妆品安全技术规范》(2015年版)中的监管空白,有利于规范化妆品行业对该类防腐剂的使用。