大体积进样气相色谱法测定空气中的痕量苯

采用气袋采样,以大体积进样气相色谱法测定空气中的痕量苯。气袋采集的样品在8h内稳定。苯含量在0．01～0．2μL／L内与对应的色谱峰面积线性相关,线性方程为A=118．45X 0．073,相关系数为0．9994。6次测定结果的相对标准偏差为2．21％,空气中苯的检出限为0．03mg／m^3。     

非苯乙烯型超高交联树脂对空气、溶液及水面浮苯的吸附性能研究

研究了3种非苯乙烯超高交联吸附树脂对空气、溶液及表面浮苯的吸附滤除性能。结果表明,在C0=1722.6mg/L和C0=181.4mg/m3的水溶液或空气体系中,CMB-CMB-XDC(二氯甲基联苯自聚后与二氯甲基苯共聚)树脂对苯的吸附量与穿透吸附量分别可达874.6mg/g和41.59mg/g;对水面浮苯的吸附在3min内可达4360mg/g以上。新型非苯乙烯树脂吸附速度快、容量大,可经再生反复使用,预期在非极性芳烃废气(水)净化及突发污染事故快速处理领域具有很好的应用前景。     

噻满酮在悬汞电极上的吸附伏安特征及分析应用

研究了噻满酮在悬汞电极上的吸附伏安行为特征，并建立了测定噻满酮的线性扫描吸附伏安分析方法；在pH=5．5的NaAc—HAc缓冲溶液中，噻满酮于-1．27V(vs SCE)产生灵敏的还原峰，噻满酮含量在0．4～20mg／L范围内与峰高呈线性关系，检出限为0．08mg／L；利用该法测定了农药制剂和农田水样中的噻满酮含量。     

固相萃取/高效液相色谱法对饲料中阿散酸、硝苯砷酸和洛克沙砷的同时测定

采用强阴离子固相萃取柱净化样品,建立了固相萃耳更／高效液相色谱法同时测定饲料中的阿散酸、硝苯砷酸和洛克沙砷的分析方法。研究了固相萃取吸附条件、洗脱条件,并对提取剂进行了优化。阿散酸、硝苯砷酸和洛克沙砷的定量线性范围为0．5～50mg／L,线性相关系数均大于0．999;检出限阿散酸为0．095mg／kg、硝苯砷酸为0．18mg／kg、洛克沙砷为0．19mg／kg;保留时间的相对标准偏差（RSD）不大于0．51％。样品中3个添加水平的平均回收率为阿散酸80％～83％,RSD为1．0％～3．8％;硝苯砷酸76％～81％,RSD为1．2％～4．6％;洛克沙砷74％～84％,RSD为1．4％-5．5％。     

不同炭吸附材料对溶液中Pb^2＋的吸附性能比较

为比较不同炭吸附材料木炭、竹炭、改性木炭和改性竹炭对溶液中铅（Ⅱ）的吸附性能,研究了pH值、吸附剂用量、吸附平衡时间等因素对吸附量的影响。动力学研究表明,它们对铅（Ⅱ）的吸附均可用准一级动力学方程描述,测定了不同炭对铅（Ⅱ）吸附的表观速率常数,Freundlich等温吸附模型能较好地描述吸附过程;以我国饮用水标准中铅的限值0．05mg／L为标准,研究了一定质量浓度及一定量含铅废水处理时,所需吸附剂投料量的估算方法和实验验证结果,结果表明,控制合适的吸附条件,竹炭能较完全有效地除去废水中的铅。     

大孔吸附树脂提取麦拓莱霉素的工艺研究

研究了用大孔吸附树脂从发酵液中分离提取新型大环内酯类抗生素-麦拓莱霉素的吸附工艺过程，对吸附条件进行了优化，得到了适宜的操作条件．结果表明：NKA树脂为最佳吸附剂：吸附最佳pH值为10．32；吸附流速选择为1ml／min；NaCl的加入对吸附不利，选择NaCl浓度为0．6％左右，本实验条件下，发酵液中的麦拓莱霉素浓度为0．18mg／ml；NKA的吸附量可达33．7mg／g树脂。     

板蓝根药渣对低浓度含铅废水的吸附特性研究

研究了板蓝根药渣对配制的低浓度含铅废水的吸附特性．结果表明，板蓝根药渣能快速、大量地吸附铅．Langmuir型吸附模型能较好地描述板蓝根药渣对铅的吸附实验数据，吸附模型为ce/q=1．9209 0．007319ce，其线性回归系数高达0．9998；溶液pH和温度是影响吸附的重要因素，pH6．0-7．0、25℃左右是吸附的适宜条件．对板蓝根药渣用0.1mol／L-0．2mol／L的NaOH溶液进行预处理，能有效提高板蓝根药渣吸附铅的能力。0．05mol/L的HNO3能有效地洗脱板蓝根药渣上吸附的铅．     

离子交换法纯化重组类人胶原蛋白Ⅱ的研究

用阳离子交换树脂CM-52分离纯化类人胶原蛋白Ⅱ（Human Collagen-like Bioprotein Ⅱ,HCBⅡ）。通过实验,分别确定了静态吸附和柱层析吸附的操作条件,即静态吸附：在pH4．0、NaCl0．15mol／L、进料浓度7g／L,处理量17．26ml／g树脂的条件下进行吸附,吸附时间为60min;柱层析：在pH4．0、NaCl0．15mol／L、进料浓度5g／L、流速5ml／min的条件下进行吸附。然后上柱,在pH4．0、NaCl0．30mol／L下进行脱附。实验表明,采用静态吸附的方式吸附HCBⅡ,然后上柱洗脱,HCBⅡ的吸附量可达到48、6mg／g树脂,回收率83．8％,操作时间短,分辨率高,最终纯化的HCBⅡ达电泳纯,分子量为97kD。     

毛细管电泳法分离测定芦丁、槲皮素和连翘苷

用毛细管电泳紫外检测法同时测定了芦丁、槲皮素和连翘苷，研究了各种条件的影响，得到了优化的实验条件，在20mmol/L的Na2B4O7(H3B03调节至pH8．40)-30mmol/L十二烷基硫酸钠-10％乙腈(1 9)的缓冲溶液中，分离电压为12kV时，芦丁、槲皮素和连翘苷在10min内得到了良好的分离，检测波长为254nm，芦丁、槲皮素和连翘苷分别在0．01-1．0mg/mL，0．01-1．0mg／mL和0．05-1．0mg/mL质量浓度范围内与电泳峰高呈现良好线性关系，检测下限分别为0．005mg/mL，0．005mg/mL和0．01mg／mL，应用于实际样品的测定。     

稻米中13种苯氧羧酸类除草剂多残留的高效液相色谱-质谱测定

建立了高效液相色谱-质谱联用（HPLC—MS）选择离子监测（SIM）同时测定稻米中13种苯氧羧酸类除草剂多残留的方法。样品经过乙腈提取,盐酸酸化,SCX阳离子交换吸附剂分散固相萃取净化后,采用HPLC—MS测定。对13种苯氧羧酸类除草剂的液相色谱分离、样品前处理条件进行了详细的研究和优化,13种苯氧羧酸类除草剂在0．02～1．0mg／L范围内线性良好,相关系数为0．9954～0．9998。在0．05～1．0mg／kg范围内,平均添加回收率为77％～99％,相对标准偏差为0．9％～14．9％。     

苯甲酰基修饰的吸附树脂对对甲苯胺的吸附机理研究

合成了用苯甲酰基修饰的新型吸附树脂ZH-03和ZH-04,同时研究了它们和AmberliteXAD-4对不同温度下水溶液中对甲苯胺的静态吸附和脱附性能,并对吸附机理进行了探讨。结果表明,经化学修饰后的树脂ZH-03和ZH-04对水溶液中对甲苯胺的吸附过程在合适温度时存在化学络合吸附作用,对吸附剂进行苯甲酰基修饰可以提高吸附剂对水溶液中对甲苯胺的吸附容量。     

化学修饰的吸附树脂对2,4,6-三氯苯酚的吸附研究

合成了用邻羧基苯甲酰基或苯甲酰基修饰的新型聚苯乙烯-二乙烯苯吸附树脂ZH-01, ZH-02和ZH-03, 利用瓶点法研究了它们和Amberlite XAD-4对288～318 K下水溶液中2,4,6-三氯苯酚的静态吸附和静态脱附特征以证实吸附质与吸附剂之间存在化学吸附, 并利用半经验分子轨道法(AM1)计算的几种吸附剂和2,4,6-三氯苯酚的前线轨道近似能级进行了解释. 结果表明: 经邻羧基苯甲酰基或苯甲酰基化学修饰后的树脂ZH-01, ZH-02和ZH-03对水溶液中2,4,6-三氯苯酚的吸附过程在合适温度时会使酚羟基和吸附剂表面的羰基发生作用, 对吸附剂进行适当的化学修饰后, 对2,4,6-三氯苯酚的穿透吸附容量均为Amberlite XAD-4树脂的150%, 饱和吸附容量是Amberlite XAD-4树脂的114％～128％.     

ADSORPTION OF 4-METHYLANILINE IN AQUEOUS SOLUTION BY BENZOYL-CONTAINING POLYMERIC ADSORBENTS

New polymeric adsorbents (ZH-02, ZH-03) containing benzoyl group for adsorbing and removing 4-methylaniline from its aqueous solutions were prepared. Studies on the isotherms and the comparison of desorption conditions evidenced through the adsorption of 4-methylaniline in water onto ZH-02 and ZH-03, namely that there are chemisorption‘s transitions at a proper higher temperature. Mini-colunm adsorption studies of 4-methylaniline on XAD-4, ZH-02 and ZH-03 at 288 K show that the breakthrough capacities are 2.39, 2.99 and 3.19 mmol/g and the total capacities are 3.45, 3.92 and 4.35 mmol/g, respectively.     

ADSORPTION OF 2,4-DICHLOROPHENOL IN AQUEOUS SOLUTION ONTO ADSORPTION RESIN MODIFIED BY N-ACETYLANILINE

A hypercrosslinked adsorption resin （ZH-05） modified by N-acetylaniline in the post crosslinking process was prepared. The adsorption properties of ZH-05 toward 2,4-dichlorophenol in comparison with granular activated carbon （GAC） and Amberlite XAD-4 were observed. The present study mainly focuses on the static equilibrium adsorption behaviors, desorption profiles and the proof of chemisorption. The results show that the Langmuir equation can give a perfect fitting to experimental data, and high temperature was favorable for adsorption of 2,4-dichlorophenol on ZH-05. A related equation was used to correlate the amount of chemisorption and the suppositionai chemisorption equilibrium concentration of adsorbate in aqueous solution. The adsorption capacities from different ranges of temperature and the static desorption experiment both reveal the same conclusion, i.e., the adsorption of 2,4-dichlorophenol from water on ZH-05 is a coexistent process of physical adsorption and chemical transition as on GAC.     

ADSORPTION CHARACTERISTICS OF CHLOROPHENOLS FROM AQUATIC SYSTEMS BY HYPERCROSSLINKED RESINS MODIFIED WITH BENZOYL GROUP

A hypercrosslinked polymeric adsorbent （ZH-03） for adsorbing and removing chlorophenolic compounds from their aqueous solutions was studied, including the static adsorption. The equilibrium adsorption data were fit to Freundlich adsorption isothermic models to evaluate the model parameters. Thermodynamic studies on the adsorption of chlorophenolic compounds on ZH-03 indicated that there were chemisorption transitions for 2,4,6-trichlorophenol and physical adsorption processes for 2-chlorophenol and 2,6-chlorophenol, and ZH-03 showed the homogeneous nature of the adsorbent surface. Column adsorption for chlorophenols wastewater shows the advantages of the ZH-03 adsorbent for adsorbing the following chlorophenolic compounds as 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol. Sodium hydroxide was used for desorpting chlorophenols from ZH-03 and showed excellent performance.     

THE ADSORPTION BEHAVIORS OF 2,6-DICHLOROPHENOL ONTO HYPERCROSSLINKED RESINS

Experimental investigations were conducted on the adsorption characteristics of 2,6-dichlorophenol by two hypercrosslinked resin, ZH-01 and XAD-4. The static adsorption was studied. Within temperature range of 288K～313K, the equilibrium adsorption date was fitted to freundlich adsorption isotherm models to evaluate the model parameters. The enthalpies, free energy,entropy were indicative of an exothermic, a spontaneous and disorder decreasing process. The magnitudes for 2,6-dichlorophenol on ZH-01 showed a chemisorption's transitions while on XAD-4shows a physical adsorption process. The results showed that the ZH-01 adsorbents were better than the Amberlite XAD-4 for removing the 2,6-dichlorophenol in aqueous solutions.     

ADSORPTION OF CHLOROFORM AND TRICHLOROETHYLENE IN WATER WITH A NEW KIND OF HYPERCROSSLINKED RESINS

In this paper two newly developed hypercrosslinked resins were used to treat micropolluted drinking water and their static and kinetic adsorption were investigated at 293 K. The results show that these two adsorbents are superior to Amberlite XAD-4 for removing chloroform and trichloroethylene in aqueous solutions. The breakthrough capacity and the total capacities from mini-column adsorption studies for chloroform and trichloroethylene on XAD-4, ZH-01 and ZH-00 are calculated respectively under experimental conditions     

超高交联树脂对苯胺和对硝基苯胺的吸附行为

吸附热力学;化学吸附;超高交联树脂对苯胺和对硝基苯胺的吸附行为     

超高交联树脂对苯胺的吸附机理研究

在静态条件下，研究了水溶液中超高交联树脂AM－1和NJ－8及大孔吸附树脂Amberlite XAD－4吸附苯胺的热力学特性，测定了不同温度下的吸附等温线。结果表明，在稀溶液中3种树脂吸附苯胺都符合Langmuir和Freundlich模型，其中AM－1和NJ－8对苯胺的吸附是一个吸热过程；由于AM－1和NJ－8的微孔结构和表面存在酸性基团的吸附中心，对苯胺的吸附是物理吸附和化学吸附共同作用的结果。     

超高交联吸附树脂吸附对硝基苯乙酮的热力学研究

比较两种超高交联聚苯乙烯吸附树脂NJ-8、AM-1与Amberlite XAD-4(以下简称XAD-4)对对硝基苯乙酮的静态吸附行为，根据吸附等温线研究了吸附热力学性质．在298～318K和研究的浓度范围内，NJ-8，AM-1、XAD-4对对硝基苯乙酮的吸附平衡数据符合Freundlich吸附等温方程．结果表明：吸附为放热过程，适当降低温度有利于吸附．计算了对硝基苯乙酮在NJ-8，AM-1、XAD-4树脂上的吸附焓变、自由能变，吸附熵变．对吸附行为作了合理的解释。