探索磷酸氢钙清洁回收工艺综合治理明胶生产废水污染

为了改善明胶生产废水高碱，高钙和高悬浮有机物污染，探索了磷酸氢钙清洁回收工艺，首先沉淀除去浸灰废液中的石灰，得浸灰清液。将浸酸废液加入浸灰清液中，调节pH至4．7－11．5，沉淀，过滤，称量，测定滤渣的红外光谱图和滤液各项污染指标。实验结果，pH为6．5－7时，磷酸氢钙收率最高，滤液各项污染指标最低，对磷酸氢钙的生产质量无妨且基本上能消耗明胶生产废水的所有碱度，所得滤渣为不含结晶的磷酸氢钙，收率与原工艺相当，所排废液pH中性，COD387mg/l,NH^ 4-P25mg/l,Ca^2 746mg/l，不再是饱和氢氧化钙溶液，不再具有高碱，高钙和高悬浮有机物特性，为后续的生物处理铺平了道路。     

用磷酸铀酰氢（HUP）消除空气中的氚

在常温常压条件下 ,用 4 -7伏的直流电场作用于不同尺寸的磷酸铀酰氢 (HUP)消氚电极 ,在静态和动态情况下 ,考查了它们的消氚特性。对于含 ( 0 51 -1 8 61 )× 1 0 8Bq氚 ,( 30 0 0 -1 2 0 0 0 )× 1 0 - 6 水分的 2 2升空气 ,消氚效率超过 95% ,用液体闪烁计数法 ,测定了消氚后磷酸铀酰氢中氚 ,其中的含量与被试验含氚空气中的氚相一致。     

磷酸铝类材料对铬(Ⅵ)吸附性能的研究

本文研究了磷酸铝类材料对水中重金属离子Cr(Ⅵ)的吸附特性。结果表明：磷酸铝类材料对Cr(Ⅵ)吸附的平衡时间为6h，最佳pH值为0．5—2．0，模板固相磷酸铝类材料的吸附性能比磷酸铝的吸附性能要好，且其吸附等温线符合Freundlich模型。实验结果说明，磷酸铝类材料对水中的重金属离子有一定的吸附能力，可应用于废水处理中去除重金属离子。     

Arsenic uptake and transport of Pteris vittata L.as influenced by phosphate and inorganic arsenic species under sand culture

In order to understand the similarity or difference of inorganic As species uptake and transport related to phosphorus in As-hyperaccumulator,uptake and transport of arsenate(As(V))and arsenite(As(III))were studied using Pteris vittata L.under sandculture.Higher concentrations of phosphate were found to inhibit accumulation of arsenate and arsenite in the fronds of P.vittata.The reduction in As accumulation was greater in old fronds than in young fronds,and relatively weak in root and rhizome.Moderateincreases,from 0.05 to 0.3 mmol/L,in phosphate reduced uptake of As(III)more than As(V),while the reverse was observed at highconcentrations of phosphate(1.0 mmol/L).Phosphate apparently reduced As transport and the proportion of As accumulated in frondsof P.vittata when As was supplied as As(V).It may in part be due to competition between phosphorus and As(V)during transport.Incontrast,phosphate had a much smaller effect on As transport when the As was supplied as As(III).Therefore,the results from presentexperiments indicates that a higher concentration of phosphate suppressed As accumulation and transport in P.vittata,especially inthe fronds,when exposed to As(V);but the suppression of phosphate to As transport may be insignificant when P.vittata exposed toAs(III)under sand culture conditions.The finding will help to understand the interaction of P and As during their uptake process in P.vittata.     

Al（Ⅲ）溶液的水解─沉淀特性研究─—磷酸根的作用

采用连续碱滴定方法和Ｘ射线衍射及红外光谱分析，研究了在Ａｌ（Ⅲ）－磷酸根溶液体系中，Ａｌ（Ⅲ）的水解－沉淀特性，结果表明，当Ｐ／Ａ１＞０．０５时，磷酸根对Ａｌ（Ⅲ）的水解－成核－沉淀过程有显著的促进作用，描述了磷酸根作用的动力学机理．     

城市浅水型湖泊底泥磷释放特性实验研究

通过对城市浅水型湖泊 (以南京玄武湖为例 )底泥磷释放特性进行实验研究 ,分析了环境因子对底泥磷释放特性的影响及其原因。得出了溶解氧、pH值、温度和扰动对底泥磷释放的影响曲线。同时说明了湖泊内源性磷对湖泊水质存在着潜在的危险性 ,为城市浅水型湖泊底泥疏浚和富营养化治理提供依据。     

液体推进剂中氧化剂废水处理方法研究

介绍了一种处理导弹氧化剂废水的方法和工艺 ,用碱中和酸、尿素除NO- 2 、絮凝沉淀法除F- 和PO3- 4 ,探索了最佳处理条件 ,确定了较为合理的处理工艺     

柘林湾水体中碱性磷酸酶的活力分布及其影响因素

首次对粤东柘林湾水体中碱性磷酸酶活力的时空分布进行了检测，并同时对酶活力与营养盐及其他水化要素的关系进行了分析。结果表明，柘林湾水体中碱性磷酸酶的活力与无机磷酸盐的含量呈显著的负相关关系，说明无机磷酸盐的浓度是水体中碱性磷酸酶的重要调控因子。     

Gene therapy for cystic fibrosis: Will it affect the uptake of prenatal carrier screening?

We report a study which examined whether the decision of 135 couples to accept prenatal cystic fibrosis (CF) carrier screening would be influenced by the advent of gene therapy. A majority (91 couples; 67 per cent) felt that gene therapy for CF would not influence their decision to be screened. Twenty-two couples (16 per cent) stated that they would decline to be screened and an equal number felt ambivalent. Even if the life expectancy of a CF sufferer were increased by gene therapy to normal, 78 per cent of couples would still wish to avail themselves of prenatal carrier screening. A majority of women who decline screening do so because they are opposed to termination of pregnancy. The availability of gene therapy could increase the proportion of couples who accept screening.     

东北三江平原土壤氧化CH4研究

三江平原土壤不同深度氧化大气浓度CH4和高浓度CH4的速率具有明显的垂直差异 .2个非淹水土壤整个剖面都具有氧化大气浓度CH4的潜力 ,以表层土的速率为最大 .非淹水的耕作土壤残留的有机质层仍保留了较强的氧化大气浓度CH4潜力 ,氧化CH4速率是耕作层的 2 0倍 .淹水土壤的大部分层次不具有氧化大气浓度CH4的潜力 .所有供试土壤均能消耗高浓度CH4,泥炭含量较高的土壤层次比矿质层氧化高浓度CH4的速率高