硝酸法处理废硬质合金回收金属钴和碳化钨

介绍了用硝酸法处理废硬质合金，回收金属钴和碳化钨的方法，并且设计了对废气氛氧化物的处理方法，消除了对环境的污染。是一种工艺简单，投资省，成本低，能耗少，污染小的回收工艺。     

镉锌交互作用对玉米幼苗生理生化特性的影响

以不同浓度的镉(Cd2 )、锌(Zn2 )处理玉米，研究CA、Zn单一及复合污染对幼苗生长及生理生化特性的影响．结果表明，随着Cd2 、Zn2 浓度的增加，CA、Zn单一及复合处理的根长，株高、根和地上部干重减少；根内丙二醛(MDA)积累增加，根系活力和叶片硝酸还原酶活性下降，叶绿素含量降低，Cd、Zn交互作用显示出协同作用的趋势。     

不同来源污泥对小青菜产量及重金属镉、铬积累的影响

用盆栽方式种植小青菜,分别施入不同来源、不同数量的污泥作为有机肥料,连续种植4季.结果表明,污泥的施用能显著的提高小青菜的产量.小青菜硝酸盐含量和重金属镉、铬的积累随着污泥施用量和施用次数的增加而呈逐渐上升趋势.按中国营养学会建议的每人每日进食蔬菜400g计算,在个别供试的高重金属含量的污泥处理中,每日可能的镉、铬摄取量达到甚至超出联合国国际农粮组织与世界卫生组织制订的ADI标准值.因此,从食品安全和人体健康角度考虑,必须研究制定污泥农用规则.     

华北平原施氮对农田土壤溶液中硝态氮含量的影响

该文通过采集土壤溶液并测定其硝态氮（N03ˉ-N),对不同施N处理下40cm-220cm土层的N03ˉ-N累积特征进行了研究。结果表明，太行山前平原褐土农田80cm和140cm-160cm处土层为N03ˉ-N浓度显著增加；200kg.hm-2的氮肥施入水平，2m-2.2m土层中土壤溶液中硝态氮浓度呈持续增长，且增加量主要发生在7月-9月份玉米生育期。     

新型膨化硝铵炸药制备的实验研究

膨化硝铵炸药以其优良的爆炸性能得到了广泛的推广应用,但其生产工艺复杂;采用硝酸铵与水、复合蜡、复合添加剂混合制成温度为105℃-110℃的溶液,将这种混合液在真空度为-0.07- -0.09 MPa压力下脱水干燥制粉,得到一种粉状膨化硝铵炸药;通过对炸药进行微观结构和性能测试,结果表明,该炸药生产工艺简单,各组份混合均匀性好,炸药的安全性能和爆炸性能优良。     

洛阳市场几类常见蔬菜硝态氮含量状况及质量评价

研究了洛阳市场常见的13种蔬菜中硝酸盐和亚硝酸盐的含量.结果表明:所有蔬菜中亚硝酸盐含量均比较低,硝酸盐含量的趋势是绿叶类>葱蒜类>根茎类>瓜类,小白菜的硝酸盐污染较重,而芹菜和大蒜的硝酸盐含量则超过三级标准,污染严重.     

高效液相色谱法测定水中常见阴离子

本文采用液相色谱法分析了水中的氯化物、硫酸盐、硝酸盐等三种常见阴离子,均取得了比较满意的结果,在时间和人力物力上也比传统方法节省了许多.     

Potential benefits of dietary nitrate ingestion in healthy and clinical populations: A brief review

Abstract

This article provides an overview of the current literature relating to the efficacy of dietary nitrate (NO₃^?) ingestion in altering aspects of cardiovascular and metabolic health and exercise capacity in healthy and diseased individuals. The consumption of NO₃^?-rich vegetables, such as spinach and beetroot, have been variously shown to promote nitric oxide bioavailability, reduce systemic blood pressure, enhance tissue blood flow, modulate muscle O₂ utilisation and improve exercise tolerance both in normoxia and in hypoxia, as is commonly observed in a number of disease states. NO₃^? ingestion may, therefore, act as a natural means for augmenting performance and attenuating complications associated with limited O₂ availability or transport, hypertension and the metabolic syndrome. Recent studies indicate that dietary NO₃^? might also augment intrinsic skeletal muscle contractility and improve the speed and power of muscle contraction. Moreover, several investigations suggest that NO₃^? supplementation may improve aspects of cognitive performance both at rest and during exercise. Collectively, these observations position NO₃^? as more than a putative ergogenic aid and suggest that increasing natural dietary NO₃^? intake may act as a prophylactic in countering the predations of senescence and certain cardiovascular-metabolic diseases.     

Reductive denitrification of nitrate by scrap iron filings

INTRODUCTION Nitrate contamination in groundwater and sur-face water has become an increasingly serious envi-ronmental problem. Anthropogenic sources such asnitrogen fertilizers, animal wastes, and septic systemsaccount for most nitrate contamination of ground-water. Nitrate itself is relatively non-toxic. However,it can be microbially reduced to nitrite, which posesseveral health threats to humans including methemo-glo-binemia, liver damage and cancers. Nitrate out-flow onto shallow cont…     

Science Letters： Simultaneous removal of nitrate and heavy metals by iron metal

INTRODUCTION Nitrate and heavy metals commonly found ingroundwater pollutants constitute significant healthrisk to humans and a burden on the environment.Mixtures of these compounds often exist in soils andgroundwater at numerous contaminated sites. Highnitrate (NO3 ) levels in drinking water supplies sig- ?nificantly endanger human health, as they are directlyresponsible for methemoglobinemia in infants (bluebaby syndrome) and may play a role in the develop-ment of som…