污染源以及环境空气中乙酸含量的测定

通过实验建立了测定污染源及环境空气中乙酸的气相色谱分析方法,给出各项指标。实验结果表明该方法分析结果准确、简单实用。并且以PTA装置气体中不同介质组成为例,探讨了含乙酸可燃气含量的测定方法。     

改性绿茶对汞的吸附研究——汞的形态分析

试验了用改性绿茶分离，冷原子吸收光谱法测定无机汞，烷基汞和苯基汞的条件。在ｐＨ５的溶液中吸附无机汞，与有机汞分离；在ｐＨ１的溶液中吸附有机汞，然后分别以１．５，３．０和６．０ｍｏｌ·１＾－１盐酸解吸无机汞，烷基汞和苯基汞，用冷原子吸收光谱法测定汞，探讨了吸附机理，分析了牡蛎和水样中汞的形态。     

Reaction of ortho-methoxybenzoic acid with the water disinfecting agents ozone, chlorine and sodium hypochlorite

Ozone, chlorine and sodium hypochlorite are commonly used as disinfecting agents for drinking water production. The reaction pathways of ozonation and chlorination of o-methoxybenzoic acid in aqueous solution were studied using gas chromatography-mass spectrometry (GC-MS) and high pressure liquid chromatography (HPLC). The results show that less than 1% of o-methoxybenzoic acid remains in reaction. The final major products using ozone oxidation are oxalic and glyoxalic acids. Phenols appear only at insufficient ozone levels. Sodium hypochlorite leads to higher levels of primary products. Molecular chlorine leads to the formation of higher amounts of polychlorinated derivatives. Model experiments allow to propose schemes of o-methoxybenzoic acid transformation under the conditions simulating water treatment processes.     

The gas-photocatalytic degradation of trichloroethylene without water

The photocatalytic degradation of gaseous trichloroethylene (TCE) without water has been studied. The degradation products were determined to be CO₂, HCl and Cl₂, and the reaction stoichiometry, was described as

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. The degradation rate was found to be linear with 0.16 power of the illumination intensity. When the TCE concentration was low (10¹⁴ mol L⁻¹ or a little more), its degradation rate model could be considered as first order kinetics. A mechanism of valence band hole oxidation was proposed.     

石墨炉原子吸收光谱法测定环境空气中的锡

研究了硝酸-双氧水体系消解、石墨炉原子吸收光谱法，测定环境空气中的锡。采用抗坏血酸和磷酸二氢铵作混合基体改进剂，热解涂层石墨管，塞曼扣背景。方法的检测限为3．56μg／L，实际样品回收率为90．6％～102％。     

Evaluation of PCDD/F congener distributions in MWI flue gas treated with SCR catalysts

Partitioning of PCDD/F congeners between gaseous and particulate phases and removal efficiencies of the air pollution control devices (APCDs) for PCDD/Fs at an existing municipal waste incinerator (MWI) in Taiwan are evaluated via stack sampling and analysis. The MWI investigated is equipped with electrostatic precipitators (EP), wet scrubbers (WS) and selective catalytic reduction system (SCR) as APCDs. The average PCDD/F concentration of stack gas is 1.49 ng/N m³, and the International Toxic Equivalent Quantity (I-TEQ) is 0.043 ng-I-TEQ/N m³. The EP increases PCDD/F concentration by 174.0% while the average removal efficiency of WS + SCR system for PCDD/Fs reaches 99.1%. In addition, the PCDF removal efficiency achieved with WS + SCR system (97.1–99.8%) is higher than that for PCDDs (96.5–99.3%). The results obtained on gas/particulate partitioning in flue gas indicate that the particulate-phase PCDD/Fs accounted for 65% at the inlet of EP, 20% at the outlet of EP and 50% at the stack, respectively, of the total PCDD/F concentrations. This study also indicates that as the chlorination level of PCDD/F congeners increases, the percentage of PCDD/Fs existing in gas phase decreases in all flue gas samples.     

石墨炉原子吸收法测定大气中锡的研究

研究了１０种基体改进剂和不同石墨管对石墨炉法测定锡的影响，结果表明，使用热解涂层石墨管并采用铁－抗坏血酸作基体改进剂，可获得最高的灵敏度和最好的回收率，用此法对锡标准样品进行测定，所得结果与定值吻合，相对误差为３．０％￣４．０％，相对标准偏差为２．０％￣４．８％，检出限为０．４０μｇ／Ｌ。     

便携气相色谱快速监测污染事故气体中甲醇

甲醇为无色挥发性澄明液体，沸点６４．７℃，比重０．７９２。甲醇对人体有麻醉作用、特别是对眼睛毒害作用明显，易造成失明。空气中甲醇含量达到６．７￣３６．５％时，形成爆炸性混合物，甲醇为易燃工业原料。甲醇的分析方法常采用比色法（１）和气相色谱法（２）两种方法均需吸收瓶盛装蒸馏水进行采样，因此分析步骤交杂费时间，不适于污染事故的快速监测，使用便携式色谱仪，可以在现场直接开展监测工作。其最低检测浓度为０．     

海水COD测定的分光光度法研究

探索了海水中COD测定的分光光度法研究，以海洋监测规范为基础，前处理(消解)部分与海洋监测规范COD分析方法相同，用比色法代替硫代硫酸钠滴定法，经过扫描波长选择524nm，比色介质高锰酸钾碱性条件稳定性较差，酸性条件下稳定性较好，消解后颜色的稳定时间l0min左右，浓度越高颜色越不稳定，该方法标准曲线的相关系数比规范法高，主要是消除了人为误差。     

气相色谱法测定工业废水中4—硝基—2,6—二氯苯胺

采用气相色谱法测定工业废水中的4-硝基-2,6-二氯苯胺。研究了样品的提取、色谱分析条件及定量方法。测定了方法的精密度和准确度。以3倍的仪器噪声计算其检出限为4.8×10~(-11)g,进样量为2μL时,最低检出浓度为0.024mg/L,线性范围为0.04～2.0mg/L;精密度实验的变异系数为0.4％～1.7％;加标回收率为97.5％～99.0％。苯胺,对硝基苯胺,邻硝基苯胺,邻氯对硝基苯胺均不干扰测定。