废锌渣制氯化锌的研究

讨论了利用废锌渣制备氯化锌的理论依据、工艺流程、影响因素及控制方法     

Evaluating the Effectiveness of Risk-Reduction Strategies for Consumer Chemical Products

Communication about risks offers a voluntary approach to reducing exposure to pollutants. Its adequacy depends on its impact on behavior. Estimating those impacts first requires characterizing current activities and their associated risk levels, and then predicting the effectiveness of risk-reduction strategies. Characterizing the risks from chemical consumer products requires knowledge of both the physical and the behavioral processes that influence exposures. This article presents an integrated approach that combines consumer interviews, users' beliefs and behaviors, and quantitative exposure modeling. This model was demonstrated in the context of consumer exposure to a methylene chloride-based paint stripper, showing how it could be used to evaluate current levels of risk and predict the effectiveness of proposed voluntary risk-reduction strategies.     

联苯胺—氢氧化钠法测定烷基磺酰氯及磺酸型表面活性剂的新方法

本文利用联苯胺—氢氧化钠法提供了一种测定十五烷基磺酰氯及烷基磺酸型阴离子表面活性剂含量的新方法。该法操作手续简便、省时、经济、精密度高,可用作工业产品的含量分析。     

六次甲基四胺合钴（Ⅱ）配合物的室温固相合成及其热色性

以六水合二氯化钴与六次甲基四胺为原料通过室温固相反应制得了钴（Ⅱ）-六次甲基四胺配合物，采用化学分析、IR、DTA和TG等手段对合成产物进行了袁征．并与液相合成法进行了比较，结果表明：配合物中Co（Ⅱ）与六次甲基四胺的物质的量之比为1：2，将六水合二氯化钴与六次甲基四胺以不同比例混合反应，所得的产物组成都为CoCl2·2C6H12N4·6H2O，该配合物具有良好的热致变色性能．     

再生骨料混凝土性能的试验研究

研究的建筑垃圾再生粗骨料中包括废混凝土块和废砖,通过控制砖在再生粗骨料中的掺量来配制再生混凝土,分析研究建筑垃圾中废砖的掺量对再生混凝土性能的影响。     

新显色剂MDMC萃取光度法测定Fe（Ⅲ）的研究和应用

文章研究了吗啉荒酸吗啉与Ｆｅ（Ⅲ）显色反应的条件,确定在ｐＨ＝４．０～６．０形成棕色配合 物,可见光区最大吸收波长λｍａｘ＝４００ｎｍ,表观摩尔吸光系数ε＝ ９． ４２ ×１０３Ｌ·ｍｏｌ－１·ｃｍ－１,应用拟定 方法测定合成水样中Ｆｅ（Ⅲ）含量,结果满意．     

Comparison of the Cancer Risk of Methylene Chloride Predicted from Animal Bioassay Data with the Epidemiologic Evidence

Methylene chloride has been shown to be a lung and liver carcinogen in the mouse; yet, the current epidemiologic data show no adverse health effects associated with chronic exposure to this compound. Hearne et al. have compared the results of a large mortality study on occupational exposure to methylene chloride to the human risk predictions based on the rodent bioassay to point out the inconsistency between the animal toxicologic and human epidemiologic data. The maximum number of lung and liver cancers predicted due to methylene chloride exposure based on the rodent bioassay data was 24 compared to 14 deaths from these cancers actually observed in the Hearne et al. epidemiology study. We assess the minimum risk detectable by the human study in order to calculate the upperbound potency of methylene chloride and compare it to the potency derived from the bioassay data. Results from the epidemiology study imply an upperbound potency of 1.5 x 10(-2) per ppm, compared to 1.4 x 10(-2) per ppm calculated using the most conservative analysis of the animal data. We conclude that the negative epidemiology study of Hearne et al. is not sufficiently powerful to show that the risk is inconsistent with the human risk estimated by modeling the rodent bioassay data. Specifically, the doses to which the workers were exposed, the population studied, and the latency period were not adequate to determine that the risks are outside the bounds of the risk estimates predicted by low-dose modeling of the animal data.     

碘化亚铜诊断管对无机汞的快速测定

氯化亚锡在酸性环境中能把 97%左右的无机汞 (HgCI2 )还原成单质汞 ,使其以汞蒸气的形式逸出与诊断管中的碘化亚铜发生呈色反应。试验表明 :诊断管中的呈色深浅、色柱高度与检液中汞含量呈正相关 ,经方差分析 ,其不同含量的逸出率差异不显著 (F 相似文献   

Sensitivity of Physiologically Based Pharmacokinetic Models to Variation in Model Parameters: Methylene Chloride

The parameters in a physiologically based pharmacokinetic (PBPK) model of methylene chloride were varied systematically, and the resulting variation in a number of model outputs was determined as a function of time for mice and humans at several exposure concentrations. The importance of the various parameters in the model was highly dependent on the conditions (concentration, species) for which the simulation was performed and the model output (dose surrogate) being considered. Model structure also had a significant impact on the results. For sensitivity analysis, particular attention must be paid to conservation equations to ensure that the variational calculations do not alter mass balance, introducing extraneous effects into the model. All of the normalized sensitivity coefficients calculated in this study ranged between −1.12 and 1, and most were much less than 1 in absolute value, indicating that individual input errors are not greatly amplified in the outputs. In addition to ranking parameters in terms of their impact on model predictions, time-dependent sensitivity analysis can also be used as an aid in the design of experiments to estimate parameters by predicting the experimental conditions and sampling points which will maximize parameter identifiability.     

论二正(异)丙氧基-三嗪的合成

以三聚氯氰为起始原料合成了四种三嗪衍生物,并用红外光谱和质谱分析法对它们进行了表征。产品检测结果表明,四种三嗪衍生物有较高熔点,在常温下不易挥发。