绿色食品产地土壤中总砷的测定

文章采用硝酸-盐酸混合试剂热消解,氢化物发生原子荧光法-定绿色食品产地土壤中总砷.方法的检出限为0.0107mg/kg,相对标准偏差为1.4%,加标回收率为97.8%～102%之间.     

改性凹凸棒土对染料废水脱色初步实验

以凹凸棒土为原料,通过复配造粒、热处理的方法对凹凸棒土进行改性,并用改性后的凹凸棒土对染料废水进行处理。考察了pH值、凹凸棒土用量及吸附时间等因素的影响,探索了最佳工艺条件。结果表明,改性后的凹凸棒土吸附性能有了明显改善,对染料废水进行处理,脱色率可达99%以上,处理废水量与吸附剂比为670颐1,且其原料价廉易得、工艺简单、成本低,是一种较好的脱色吸附剂。     

从废电子元件提钯后的残渣中提取银

氯化浸出钯后，浸渣中的银以氯化银状态存在，用铁粉置换使氯化银转变成金属银，经过滤，洗涤后用硝酸浸出，氯化钠沉银，然后还原得银粉。     

利用苛化泥制备活化碳酸钙

苛化泥中所含的碱和硅，铝，铁，锰等杂质可籍选择性浸出，反浮选，还原提取等方法去除。除杂质后的物料用表面活性改性后可获得合乎商品要求的活化碳酸钙。     

高效经济除铅吸附剂的开发与应用

本文通过对凹凸棒石粘土的改性处理探讨高效除Pb吸附剂的加工制作方法和条件。用0.5mol/L H_2SO_4处理8h后,再在450℃下热处理1h所得的制剂性能稳定。Pb吸附量大,且除Pb速度快,在30min之内即可完成平衡吸附的96%以上,Freundlich吸附指数为0.165。     

水中硝酸盐氮测定的几点经验

在酚二磺酸光度法测定水中硝酸盐氮过程中，统一校准曲线的绘制和样品测定的操作步骤，可使两者的分析误差趋于一致。无水条件的保证是样品分析的关键之一。     

超细煤矸石矿粉作天然橡胶补强填充剂的性能研究

以煤矸石为原料，通过超细粉碎、表面改性等深度加工，制取了一种新的橡胶补强剂，并对煤矸石作补强剂影响因素进行初步的研究，实验表明它能够取代或部分取代炭黑用作天然橡胶的补强剂。     

《卡塔赫纳生物安全议定书》与WTO规则冲突研究

In the late thirty years biotechnology, with transgenic technology as its core，has been developed rapidly and applied in fields such as agriculture and medicine with great achievements， which has caused profound impacts on society and economy, However because of scientific uncertainties of influences of transgenrc technology and derived products on human, plant and animal life and health as well as the environment,biosafety。i.e management of biotechnology so as to minimize its potential risks to the environment and human health, has become an issue with increasing concern of the internatronal community，In this context, negotiation of an international treaty was initiated in 1996 and the Cartagena Protocol on Biosafety was adopted in January 2000 and came into effect in September 2003 ,As the first international treaty containing direct stipulations on living modified organisms (LMOs) trade, the Protocol encountered divergence and controversy in the negotiation process, After adoption of the Protocol, compatibility of its provisions with those set in the WTO agreements has turned into a hot issue for dispute in the international forum。     

魔芋葡甘聚糖在污水处理中的应用

该文就魔芋葡甘聚糖的发展研究状况作了概述，并探讨其与蛋白质共混胶应用于水处理的可能性。