5%硫脲+5%抗坏血酸及10%硫脲对水中低浓度砷测定的影响

文章通过用5%硫脲+5%抗坏血酸及10%硫脲分别对马厂洲污水厂进出口水样和新阳桥水样进行砷测定分析,结果表明,当用5%硫脲+5%抗坏血酸分析时马厂洲污水厂进口砷浓度值为1.6μg/L、出口砷浓度为1.1μg/L、新阳桥砷浓度值为0.5μg/L,用10%硫脲分析时马厂洲污水厂进口砷浓度值为1.7μg/L、出口砷浓度为1.1μg/L、新阳桥砷浓度值为0.4μg/L。因此得出结论,当水样中砷浓度较低时5%硫脲+5%抗坏血酸及10%硫脲对砷的测定影响相当,可用10%的硫脲替代5%硫脲+5%抗坏血酸。     

32%转产30%的烧碱运行分析

分析了32%碱转产30%碱的可行性,对比了转产后节能降耗情况。     

60%滴

60%滴·嗪·乙乳油(2,4滴丁酯+嗪草酮+乙草胺)为大豆田苗前土壤封闭除草剂.试验结果表明于大豆播后苗前使用60%滴·嗪·乙乳油1800～2250 g a.i./hm2,防效达90%以上.对大豆安全,不影响后作.     

热电材料掺杂1%稀土转移率提高25%

美国能源部阿姆斯国家实验室的科学家日前发现,只需在一种热电材料中掺杂1%的稀土元素,就可将热电材料的转移率提高25%。该项目负责人伊维根.列文表示:"这是科学家首次如此大幅度地提高热电转移效率。"     

我国城市污水处理率已达87%,村庄仅为8%

正在2014年6月20日上午召开的第八届环境技术产业论坛上,住建部村镇建设司司长赵晖说,截止到2012年,城市污水处理率已达到87%,但村庄的污水处理率只有8%。此外,截止2012年,县城的污水处理率接近80%,但建制镇的污水处理率不到30%。建制镇未处理而外排的污水总     

米其林2015年销售额增长8.4%

米其林近日公布了2015年度财务报告,其全年销售额为211.99亿欧元,同比(下同)增长8.4%;扣除非经常性项目前的营运利润25.77亿欧元,增长18.75%,占净销售额的12.2%,增加1.1个百分点;净利润11.63亿欧元,增长12.8%。全年轮胎销量增长3.2%,各业务部门表现均优于市场,乘用和轻卡轮胎表现尤为出色,销量增长6.7%;其中第四季度轮胎销量增长4.2%,乘用和轻卡轮胎增长8.7%。市场回顾乘用车及轻卡轮胎市场     

10%甲氨基阿维菌素苯甲酸盐悬浮剂配方开发

研制了性能稳定的10%甲氨基阿维菌素苯甲酸盐悬浮剂。通过对润湿分散剂、防冻剂、增稠剂的筛选,确定了10%甲氨基阿维菌素苯甲酸盐悬浮剂优惠配方。用TURBISCAN LAB分散稳定性分析仪对甲氨基阿维菌素苯甲酸盐悬浮剂的稳定性进行了分析研究。优惠配方组成:78.2%甲氨基阿维菌素苯甲酸盐原药质量分数为12.8%,润湿分散剂GY-SC85质量分数为5.0%,防冻剂尿素质量分数为4.0%,增稠剂黄原胶质量分数为0.2%,硅酸镁铝质量分数为0.8%,消泡剂GY-X60质量分数为0.2%,水的质量分数为77.0%。该优惠配方具有较好的适应硬水的性能,制成的制剂具有较好的分散稳定性。     

印度氯化钾进口量同比将下降5%～7%

<正>日前,印度主要进口商IPL表示,由于全球价格上涨和政府补贴减少,印度氯化钾进口量可能同比下滑5%~7%。据统计,2016年4月至今年3月,印度进口氯化钾374万t,较上一年增长15%。经印度化肥部确认,印度将把2017—2018财政年度对氯化钾的补贴减少20%,至7437卢比/t。     

65%吡虫啉悬浮剂的研制

介绍了农药悬浮剂的加工方法及其优点,介绍了吡虫啉悬浮剂在同类杀虫剂中的优势,通过(50±2)℃热储对润湿分散剂,增稠剂,防冻剂进行了筛选,采用湿法研磨得出最佳配方:吡虫啉65%,改性磷酸酯盐(以AP表示)4%,木质素磺酸钠1%,黄原胶(1.5%黄原胶母液)1%,乙二醇3%,水余。经测定悬浮率95%以上,热储(50±2)℃,分解率<5%,产品各项指标符合悬浮剂要求。     

预计2014年巴西农药销售将增长6%～9%

<正>据巴西植物保护产业联盟(Sindiveg)估计,2014年巴西农药销售增长率将在6%~9%之间,总额将在130亿美元左右。销售主要受到大豆种植面积增长的驱动。大豆作物产品的销售额约为58.6亿美元,占总销售额的51.3%。据Sindiveg信息经理Ivan Sampaio称,2012年大豆作物产品占总农药销售额的49%,之后的2013年增长了3%。2014年,大豆将继续推动巴西农化市场的增长。Sindiveg主席Valdemar Fischer表示,作物种植面积的扩张导致对农化产品的需求上涨。总销售额中将近60%的销售集中     

2010～2011年世界塑料工业进展

收集了2010年7月～2011年6月世界塑料工业的相关资料,介绍了2010～2011年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、ABS树脂),工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚),特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮),通用热固性树脂(酚醛、不饱和聚酯树脂、环氧树脂、聚氨酯)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

Mechanisms Governing Anaphylaxis: Inflammatory Cells,Mediators, Endothelial Gap Junctions and Beyond

Anaphylaxis is a severe, acute, life-threatening multisystem allergic reaction resulting from the release of a plethora of mediators from mast cells culminating in serious respiratory, cardiovascular and mucocutaneous manifestations that can be fatal. Medications, foods, latex, exercise, hormones (progesterone), and clonal mast cell disorders may be responsible. More recently, novel syndromes such as delayed reactions to red meat and hereditary alpha tryptasemia have been described. Anaphylaxis manifests as sudden onset urticaria, pruritus, flushing, erythema, angioedema (lips, tongue, airways, periphery), myocardial dysfunction (hypovolemia, distributive or mixed shock and arrhythmias), rhinitis, wheezing and stridor. Vomiting, diarrhea, scrotal edema, uterine cramps, vaginal bleeding, urinary incontinence, dizziness, seizures, confusion, and syncope may occur. The traditional (or classical) pathway is mediated via T cells, Th2 cytokines (such as IL-4 and 5), B cell production of IgE and subsequent crosslinking of the high affinity IgE receptor (FcεRI) on mast cells and basophils by IgE-antigen complexes, culminating in mast cell and basophil degranulation. Degranulation results in the release of preformed mediators (histamine, heparin, tryptase, chymase, carboxypeptidase, cathepsin G and tumor necrosis factor alpha (TNF-α), and of de novo synthesized ones such as lipid mediators (cysteinyl leukotrienes), platelet activating factor (PAF), cytokines and growth factors such as vascular endothelial growth factor (VEGF). Of these, histamine, tryptase, cathepsin G, TNF-α, LTC₄, PAF and VEGF can increase vascular permeability. Recent data suggest that mast cell-derived histamine and PAF can activate nitric oxide production from endothelium and set into motion a signaling cascade that leads to dilatation of blood vessels and dysfunction of the endothelial barrier. The latter, characterized by the opening of adherens junctions, leads to increased capillary permeability and fluid extravasation. These changes contribute to airway edema, hypovolemia, and distributive shock, with potentially fatal consequences. In this review, besides mechanisms (endotypes) underlying IgE-mediated anaphylaxis, we also provide a brief overview of IgG-, complement-, contact system-, cytokine- and mast cell-mediated reactions that can result in phenotypes resembling IgE-mediated anaphylaxis. Such classifications can lead the way to precision medicine approaches to the management of this complex disease.     

Fireclay Refractory Bricks for Hot Blast Stove

This standard specifies the classification, shape, dimension, technical requirements, test method, inspection rules, packing, marking, transportation, storage and quality certification of fireclay refractory bricks for hot blast stove.     

Hydrocarbon components of the yellowheaded spruce sawfly sex pheromone

The primary sex pheromone of the yellowheaded spruce sawfly,Pikonema alaskensis (Rohwer) (Hymenoptera: Tenthredinidae), was found to include a series of straight-chain hydrocarbon dienes, all with the double bonds in the 9 and 19 positions and all with the (Z, Z) configuration. The major components, of 29, 31, 33, 35, and 37 carbon atoms, were synthesized. In the field and the greenhouse, the synthetic dienes were far above control levels in activity but, at least during the first hours of bioassay, were somewhat less active than the female-derived materials on a weight basis. In the field, a mixture of all five synthetic dienes, in the proportions found in the females, was more attractive than any single one, on a mole basis. In addition, (Z, Z)-9,19 dienes of 28, 30, 32, 34, 36, 38, and 39 carbons have been detected in females in minor amounts. The first five were bioassayed, and each was found to be similar in activity to the 35-carbon component when compared on a weight basis. The synthetic dienes, while active by themselves, were strongly synergized by two, more polar, Florisil fractions derived from females. Experimental design considerations are discussed.     

中低温煤焦油蒸馏过程中金属元素的迁移规律

以中低温煤焦油轻油和重油为实验原料,采用常压蒸馏获得170~200℃、200~240℃、240~270℃、270~300℃、300~320℃、320~340℃、340~360℃和360~390℃煤焦油馏分油;利用配有油品加氧制冷进样系统的ICP-OES测定了21种微量元素在馏分油中的含量,考察了不同馏分油中元素的分布情况。研究表明：在原煤焦油中,未发现Ag、Mg、Mo、Na、Ni、Fe、Mn、Cr及Ti元素,含量较高的元素有Sn、P、Al、Pb、Si,其中Sn元素在轻油和重油中的含量分别为11.78μg/g和14.04μg/g;在所有馏分油中,未发现Al、Mo、Fe、Mn、Cr及Ti元素,含量比较高的元素有Si、Sn、Na、Zn、Pb,特别是Si、Na、Sn、Zn、Ni、Pb及B元素可以有效富集于馏分油中。可能的原因是Ca、Fe、Mg、Al等金属以不同的盐类形态存在,在煤焦油脱水及<170℃蒸馏过程中,这些金属盐类会被部分带出,导致其在馏分油中的含量未富集或未检出;通过关联金属元素在馏分油中的分布与其组成的关系,馏分油中元素的分布可能与酚类化合物、杂环化合物和蒸馏温度等相关。酚类化合物及杂环化合物可能与Ag、B、Cu、Mo、Sn、Na、Zn、Ca、Pb等金属形成络合物或卟啉配合物,蒸馏温度一方面可以破坏Sn、Cd、Pb、Zn、Cu、Ca、Pb等元素在馏分油中的结合力,另一方面也可以促进这些元素与馏分油中的含氧、含氮等化合物更好地发生化合反应,进而影响金属元素在馏分油中的含量分布。     

陶瓷名物探源二则

匋、陶、窑(窯)上古皆读成舌头音,意义又相通,实际为一个意义上先后产生的几个形体不同的字,先民以陶(匋)既称呼窑灶,又指窑灶出品之物,又指制作陶器;坏(坯)、瓶、瓬、瓿、甂、缶、钵、皿、杯(盃)、盆(瓫)均指窑灶所出之物或后世模仿窑灶出品之物,其字皆由重唇音演变而来,亦为同胞兄弟的同源词。     

铋系半导体光催化剂研究进展

铋系半导体材料具有特殊的层状结构以及合适的带隙,具有良好的可见光响应能力以及稳定的光化学特性,作为一类新型的环境友好型光催化剂在环境修复与解决能源危机等领域受到广泛关注,已成为近年来的研究热点。然而,铋系半导体光催化剂距离实际大规模应用仍存在一些亟需解决的问题,如光生载流子复合率高、对可见光谱的响应范围有限、光催化活性较差、还原能力较弱等。本文首先介绍了铋系半导体材料的典型特征、制备方法与反应机理,在此基础上着重阐述了铋系半导体光催化在形貌调控、构建异质结、离子掺杂、碳质材料掺杂、贵金属沉积、染料敏化等改性手段的研究进展以及在降解水体污染物、杀菌消毒、空气净化、制氢、还原CO2、有机合成等领域的应用成果。最后对铋系半导体光催化剂的未来前景做出展望,指出其未来的研究方向应致力于从多手段耦合改性、拓展其应用领域以及深入探究反应机理等方面开展。     

抗菌防腐剂（Ⅰ）—抗菌防腐剂的历史、定义与分类

简要回顾了抗菌防腐剂的发展历程,进一步明确了杀菌剂,抑菌剂,抗菌剂,防腐剂,防霉剂,消毒剂,杀生剂,保鲜剂,抗生素的概念。同时,结合抗菌防腐剂的发展在对抗菌防腐剂按无机物,有机物和天然物分类的基础上,进一步又按化学结构和官能团将抗菌剂分为有机金属,有机卤代物,醇,酚,醚,醛,酮,醌,酸,酯,含氮类,含硫类,有机磷,有机砷类以及杂环类等。     

典型过程强化技术在纳米材料制备中的应用进展

纳米材料被誉为21世纪的新材料,广泛应用于化工、电子、国防、陶瓷等领域.传统的纳米材料制备方法面临粒径控制较困难、批次间重复性差,存在放大效应等不足.过程强化技术是化学工程学科的研究前沿和热点方向之一,旨在通过在生产过程中采用新工艺、新设备等手段,实现缩减操作单元、减小设备体积、提高生产能力及能量利用效率的目的,是实现...     

Low-molecular weight organic compositions of acid waters from vegetable oil soapstocks

Alkaline extracts (soapstocks) from canola, corn, cottonseed, peanut, soybean, and sunflower oil refining were acidified, and identities and concentrations of the low-molecular weight organic components of the resulting acid waters were determined by gas chromatography, followed by mass spectroscopy, and by high-performance liquid chromatography. The main components of each acid water sample, in order of decreasing concentration and after omitting the fermentation product lactic acid, were phosphoric acid, α-glycerophosphate, and glycerol from canola;myo-inositol, phosphoric acid, α-glycerophosphate andmyo-inositol-1-phosphate from corn; glycerol, α-glycerophosphate,myo-inositol-1-phosphate, and β-glycerophosphate from cottonseed; phosphoric acid, glycerol, andmyo-inositol from peanut; α-glycerophospho-1-myo-inositol,myo-inositol-1-phosphate, α-glycerophosphate, and glycerol from soybean; and α-glycerophosphate, glycerol,myo-inositol-1-phosphate, and β-glycerophosphate from sunflower.