四氟乙烯清洁生产工艺和污染控制

分析了传统空管裂解生产四氟乙烯工艺存在的污染问题 ,介绍了水蒸汽稀释裂解生产四氟乙烯工艺的污染控制情况。     

Prenatal diagnosis of mosaic 4p – in a fetus with trisomy 21

Mosaicism for the Wolf-Hirschhorn syndrome, del(4)(p16), is extremely rare and has not been reported in association with a numerical chromosome abnormality. We report the prenatal diagnosis of mosaic del(4)(p16) and non-mosaic trisomy 21 in a 16-week female fetus. The pregnancy ended in spontaneous abortion at 34 weeks secondary to fetal demise. The fetus had features of both 4p – and trisomy 21.     

Detecting neural tube defects by amniocentesis between 11 and 15 weeks' gestation

Forty-two open neural tube defects (NTDs) were identified in our series of 7440 amniocenteses tested between 11 and 15 weeks of gestation. Using a cut-off of ≥2.0 MOM, the detection rate for open NTDs was 95 per cent; 100 per cent each for anencephaly and spina bifida; and 78 per cent for encephalocele. Two encephaloceles had AFP levels less than 2.0 MOM and negative AChEs. Thirty-four (81 per cent) of these NTDs were tested between 13 and 15 weeks and 8 (19 per cent) before 13 weeks. There were 0.6 per cent false positives by AFP (excluding serious abnormalities and fetal death) and 0.1 per cent after AChE. The likelihood of an open NTD after an elevated AFP (≥2.0 MOM) was 24 and 77 per cent for any serious abnormality. These results, when combined with an earlier study, indicate that amniotic fluid AFP appears to be as sensitive a test for open NTDs between 13 and 15 weeks as between 16 and 20 weeks. Additional experience is necessary to determine this before 13 weeks.     

The curve of ion exchange ratio(%)-pH of the interaction between suspended particles with Cd(II) in the Yellow River

The curve of ion exchange ratio(%)-pH of the interactionbetween suspended particles with Cd(II) in the Yellow River wasstudied. The effects of lysine on this curve have been alsoinvestigated. The results showed that (1) Cadmium in Cd(OH)+ formin the suspended particles exchanges with the cations.The exchangeratio of Cd2+ is nearly at its greatest value in the range of pH(8.0-8.5) in natural aquatic system; (2) Ion exchange ratiodecreases as the concentration of Cd2+ raises from 8.9×10-6 mol/L to 2x8.9 x 10-6mol/L; (3) At the lysine concentration of 6.8x10-6 mol/L, it can promote the ion exchange ratio; (4) Adsorption of thesuspended particles to cadmium is weaker in seawater and Jin ShaRiver than in the Yellow River.     

长江中下游海相三叠系膏盐层与铜(金)、铁矿床

长江中下游海相三叠系膏盖层中含有很大比例的大、中型铜（金）、铁、多金属矿床。膏盐层不仅是铜（金）、铁矿床的主要赋矿层位之一，而且是部分成矿金属的矿源层；膏盐层还为燕山期岩浆提供部分钠质、钾质及挥发组分，影响岩浆演化的方向，改变了含矿流体的性质；另外，从岩体和矿床中金属硫化物中流同位素重硫成分的增高，说明在成者、成矿过程中，膏盐层是硫的供应者之一。因此膏盐层与铜（金）、铁、多金属矿床之间存在着特殊的成因联系。     

含湿Ca(OH)2颗粒脱硫反应特性的模型研究

在半干法脱硫装置中脱反应主要表现为湿Ｃａ（ＯＨ）２颗粒与ＳＯ２的反应，在液相反应溶解和传质理论基础上，通过对含湿Ｃａ（ＯＨ）２颗粒内反应机理的研究分析提出了含湿Ｃａ（ＯＨ）２颗粒相比发生明显变化。     

Hydrolytic dynamics of pesticide N''-(2,4-dimethylphenyl) -N-methylformamidine in aquatic solution

ＨｙｄｒｏｌｙｔｉｃｄｙｎａｍｉｃｓｏｆｐｅｓｔｉｃｉｄｅＮ＇－（２，４－ｄｉｍｅｔｈｙｌｐｈｅｎｙｌ）－Ｎ－ｍｅｔｈｙｌｆｏｒｍａｍｉｄｉｎｅｉｎａｑｕａｔｉｃｓｏｌｕｔｉｏｎ￥ＭｏＨａｎｈｏｎｇ；ＹａｎｇＫｅｗｕ；ＡｎＦｅｎｇｃｈｕｎ；ＬｉｕＹｅ...     

Effects of fluoride on growth and reproduction of the army worm, Mythimna separata (Walker)

This paper deals with effects of airborne fluorine on the army worm, Mythimna separata (Walker), by rearing the larvae on the wheat foliage exposed to HF or fumigating the larvae on the artificial diet with the pollutant. Larval relative growth rate (GR) and index of population trend of the insect reduced by 5% and 11%, respectively, when the larvae were reared on the foliage taken from the wheat plants exposed to 0.87 g·dm-2·day-1 of fluorine compared with those of the control. An extra instar appeared in a majority of the larvae treated. Survival rate and GR of the larvae on the wheat plant being exposure to the same concentration of fluorine in field open-top fumigation device were 40% and 15% lower than that of the control, respectively. Similar experiment with the insect on the artificial diet also showed that direct impact of the pollutant on the army worm was greater than its indirect effect via their host plant.     

A novel technology for quick acclimation of an anaerobic microbial consortia used for biodegrading teraphthalic acid (TA)

ＩｎｔｒｏｄｕｃｔｉｏｎＴｅｒａｐｈｔｈａｌｉｃａｃｉｄ (ＴＡ)ｉｓｏｎｅｏｆｔｈｅｐｅｔｒｏｃｈｅｍｉｃａｌｓｗｉｄｅｌｙｕｓｅｄｉｎｔｈｅｓｙｎｔｈｅｓｉｓｏｆｐｏｌｙｅｓｔｅｒｆｉｂｅｒ,ｖｉｄｅｏｆｉｌｍｓａｎｄｏｔｈｅｒａｐｐｌｉｃａｔｉｏｎｓ .Ｓｉｎｃｅｂｉｓ (2 ｅｔｈｙｌｈｅｘｙｌ)ｐｈｔｈａｌａｔｅ ,ｄｉｅｔｈｙｌｐｈｔｈａｌａｔｅａｎｄｄｉｍｅｔｈｙｌｐｈｔｈａｌａｔｅｈａｖｅｂｅｅｎｃｌａｓｓｉｆｉｅｄａｓｐｒｉｏｒｉｔｙｈａｚａｒｄｏｕｓｃｏｍｐｏｕｎｄｓｂｙＥＰＡｏｆｔｈｅ…     

空气污染指数模式的改进

我国目前以空气污染指数API报告各城市的环境空气质量。由于我国各地环境空气质量状况差异很大,该方法在报告城市空气质量时具有较大的片面性,不能综合反应污染状况。本文针对现行的API指数法进行了模式推算和改进,新的计算模式可更客观全面地反映城市空气质量。