原子吸收石墨炉技术测定水中痕量阴离子洗涤剂

本文研究了用乙二胺铜(Ⅱ)—氯仿作为络合—萃取体系,石墨炉原子吸收技术间接测定水中痕量阴离子洗涤剂的一种方法。其检出限为2.0ug/1,加标回收率为89.6%～104.5%。具有选择性好、灵敏度高、快速简便等特点。同时还研究了水样的酸度和共存离子对测定的影响。对于用原子吸收进行有机分析具有一定的实际意义。     

剥壳机系统噪声控制技术

剥壳机生产系统将胡豆打碎和去壳时发出严重的扰民噪声,对产生噪声的设备和管道采用隔声和吸声控制措施。结果表明,效果十分明显,达到了国家环境噪声排放标准。     

AAS与ICP－AES间接测定天然水中硫酸盐

本文以与过量形成ＢａＳＯ＿４沉淀反应为基础，较详细地讨论了反应条件、从而拟定了用ＡＡＳ和ＩＣＰ－ＡＥＳ间接测定天然水中的方法、确定了方法的精密度，ＡＡＳ法的ＲＳＤ％为１．５，ＩＣＰ－ＡＥＳ法为３．２．两种方法对比分析的结果接近，误差为１．０％（相对）。用于天然水中的测定，获得满意的结果。     

Effects of Starch Moisture on Properties of Wheat Starch/Poly(Lactic Acid) Blend Containing Methylenediphenyl Diisocyanate

Methylenediphenyl diisocyanate was found to improve the interfacial interaction between poly(lactic acid)(PLA) and granular starch. The objective of this research was to study the effect of starch moisture content on the interfacial interaction of an equal-weight blend of wheat starch and PLA containing 0.5% methylenediphenyl diisocyanate by weight. Starch moisture (10% to 20%) had a negative effect on the interfacial binding between starch and PLA. The tensile strength and elongation of the blend both decreased as starch moisture content increased. At 20% moisture level, the starch granules embedded in the PLA matrix were observed to be swollen, resulting in poor strength properties and high water absorption by the blend.     

环境水样阴离子表面活性剂光度测定法

本文通过实验研究,提出了对河水及生活废水阴离子表面活性剂的水相直接测定方法,此方法具有简便、快速的特点,且有良好的准确性和再现性。     

省沽油中硒含量及其测定方法研究

采用消化液硝酸／高氯酸消解法、硝酸-硫酸消解法和微波消解方法消化省沽油，用原子吸收分光光度法测定硒（Se）含量。比较了3种消解方法在测定省沽油中的硒含量。发现微波消解法测定野生省沽油（干菜）中Se含量准确性好、时间段效率高、对环境污染少、操作简单。     

军用浸渍活性炭中银含量测定方法——火焰原子吸收分光光度法

本研究建立了一种用空气-乙炔火焰原子吸收分光光度法测定浸渍活性炭中银含量的分析方法，对酸介质浓度、共存元素的干扰进行了探讨，在0—1．0ml沪范围内，银含量与吸光度呈线性关系，相关系数为0．9999。对09型浸渍活性炭标准物质进行测定，测定结果的相对标准偏差为0．191％（n=10），加标回收率为97．5％-101．4％。     

EVALUATION OF COPPER ACCUMULATION IN PART OF THE CALIFORNIA AQUEDUCT1

ABSTRACT: Copper sulfate has been used extensively in the California Aqueduct to control phytoplankton and the alga Cladophora. Since 1969 more than 250,000 pounds of copper sulfate has been added to a part of the aqueduct. Although copper sulfate is effective in controlling algae, copper tends to accumulate in the system in which it is applied. Samples of water, biota including plants, clams, and snails, as well as sediment were analyzed for copper. Results of these analyses showed that copper concentrations in the water, with three exceptions, were less than 10 micrograms per litre. Samples of plant tissue showed a 198 percent increase in copper concentration in the treated reach of the aqueduct, and clam tissue showed a 68 percent increase. Snails in the treated reach had 77 percent more copper than in the untreated reach whereas copper concentrations in the sediment doubled. None of the concentrations found are considered to be harmful to the biota.     

三烧溴化锂集中制冷空调系统改建设计

武钢三烧区域改建了二台大连三洋蒸汽型双效溴化锂吸收式制冷机。叙述了该改建项目的主机选型、参数选定、设计特点等。     

Increase in Hair Lead, but not Blood Lead Content of Occupationally-Exposed Workers

This study attempted to investigate whether increased hair lead concentrations due to environmental exposure are accompanied by parallel increases in blood lead concentrations. A sample set consisting of both occupationally-exposed individuals and persons from the general population was investigated. The lead content of scalp and pubic hair from the general population (n=189), traffic police personnel (n=27) and battery workers (n=22) were analysed. The hair samples were taken from the nape of the neck by cutting 23 cm closest to the scalp and cleaned using a washing procedure developed in our laboratory. The effectiveness of the washing procedure was partly determined by examining the scanning electron micrographs of the hair samples. Venous samples of blood were taken from each volunteer's arm.The traffic police and battery plant operators sampled had significantly higher average scalp hair and pubic hair lead levels than the non occupationally-exposed general population. No significant differences were found between the blood lead values of these workers and the general population. Compared to the general population both occupationally-exposed groups had significantly more symptoms of lead toxicity.Lead particles were still observed on the hair shafts after the washing procedure. The amount of such lead contamination was difficult to quantify, the problem being further exacerbated by the difference in hair texture of the persons sampled. This exogenous contamination therefore detracts from the usefulness of hair as an indicator of lead exposure.