Understanding the Underwater Behaviour of Scuba Divers in Hong Kong

Diving-related activities may constitute a major threat to coral reefs. This study aimed to quantify the impact of diving in Hong Kong on hard corals and understand how socio-economic characteristics and experience level of divers influence diver-inflicted damage. We recorded and analysed the underwater behaviour of 81 recreational divers. On average, a diver was in contact with marine biota 14.7 times with about 40 % of contacts involved corals and 38 % were damaging contacts with corals or other biota in a single dive. The most harm-inflicting groups included inexperienced and camera-carrying divers. Although Hong Kong divers did not make many damaging contacts with corals, there is still an imminent need to determine the scale of damage from diving activities on the marine ecosystem given the rapid development of marine-based tourism and the limited coral-inhabited areas in Hong Kong where the marine environment is already under stress from anthropogenic activities.     

柠檬酸强化钢渣湿法烧结烟气脱硫及机理

在鼓泡反应器中考察了添加柠檬酸强化钢渣湿法烧结烟气脱硫的影响因素,包括钢渣粒度,吸收浆液浓度、进口二氧化硫浓度、停留时间,pH值,柠檬酸与钢渣的浸泡时间等,结果表明,柠檬酸浓度为2.0 mmol/L、钢渣浓度为4%、二氧化硫进口浓度为1 500 mg/m3、烟气停留时间为7 s、钢渣强化时间为2 h、钢渣粒度>200目,脱硫率达到90%以上。经4 mmol/L的柠檬酸强化后的钢渣浆液脱硫率比单纯钢渣浆液提高18.41%,达到90.99%的脱硫率,且有效反应时间延长50%,达到60 min以上。柠檬酸的加入,一方面促进了钢渣碱性组分溶解,另一方面在吸收液中形成柠檬酸和柠檬酸盐缓冲体系,增加了气液界面SO2浓度,提高了SO2的气液传质速率。     

膨润土的2种不同柱撑改性方式及其吸附重金属锌离子的比较

考察了钙基膨润土钠化过程中改性剂的用量,矿浆浓度,改性时间等对改性效果的影响,并测试了不同超声反应时间、陈化时间等条件下制备的钠化膨润土的性能,如:膨胀容,膨润值和阳离子交换容量CEC,然后分别以Al13-Cl和Al13-SO4方式嵌入矿物层间域中制备柱撑膨润土,考察和比较了不同陈化时间下2种柱撑膨润土煅烧前后的微观结构,及其对污水中锌离子的吸附去除效果,结果表明,Al13-Cl改性方法制备的柱撑膨润土对锌离子的吸附性能明显优于Al13-SO4柱撑效果。     

Associations of bisphenol exposure with thyroid hormones in pregnant women: a prospective birth cohort study in China

Environmental Science and Pollution Research - Bisphenols are endocrine disruptor chemicals that disrupt thyroid hormone homeostasis. However, evidence on the effects of bisphenol mixtures on...     

生态环境监测及其发展的研究

本文以生态环境监测工作为研究对象,以其在现阶段的应用开发状态为基础,分析未来科技成长中的发展趋势。在论述中,将生态环境监测的目标与特征内容作为理论基础,引出当前生态环境监测工作发展的现状问题,并针对管理体系、技术手段、3S开发这三个方面,为相关研究提供例证。     

Continuous electrocoagulation degradation of oily wastewater with Fe78Si9B13 amorphous ribbons

Environmental Science and Pollution Research - The oily wastewater was treated by electrocoagulation with Fe78Si9B13 amorphous ribbons as anode and graphite plates as cathode under such processing...     

几种鞋底材料耐油性能评价

本文对丁腈橡交（NBR）、聚氨酯（PU）、改性聚氯乙稀（PVC）等鞋底材料进行耐油性能试验，分析其在2，2，4-三甲基戊烷中浸泡后体积、质量和硬度等方面的变化规律，揭示变化机理，综合评价其耐油性能，提出对浸泡后体积缩小情况的总协定建议。     

推动绿色包装实现包装业可持续发展

本文分析了我国绿色包装的发展现状和面临的困境，提出必须从环境保护、循环经济、绿色市场和技术进步等方面推动绿色包装，实现包装业可持续发展。     

分光光度法同时测定废水中的Cr^6＋和Cr^3＋

本文介绍了在盐酸和硫酸介质中，蒸馏分离Cr^6 ，碘化钾溶液吸收，分光光度法测Cr^6 ；Cr^3 用高氯酸氧化后，以同样方法测定。最大吸收波长为590nm，表观摩尔吸光系数e为6．1×10^4。