Acute(急性) and chronic(慢性) toxicity Acute toxicity refers to a rapid and serious response to a high but short-lived dose Acute poisons interfere with essential physiological processes, leading to a variety symptoms of distress, even death Chronic toxicity refers to a time-lagged response to a relatively low but prolonged exposure

一、铅蓄电池与再生铅行业发展现状 二、环保现状与存在问题 三、目标 四、铅蓄电池相关环保政策、法规、标准 五、铅污染防治对策 六、亟待研究解决的问题 七、环保政策对铅产业的影响 八、铅蓄电池行业发展趋势

Plant nutrients Plant growth requires various nutrients Major nutrient elements: C,N, P trace elements: S, Si, Cl, I, and metallic elements(Fe, Mn, Cu, etc) The minor elements because of the low demand can Water y be supplied at adequate rates in natural

Water vapor in the air The volume of Water vapor is variable, depending on temperature, precipitation, rate of evaporation and other factors at a particular location The percentage of water vapor ranges from 0.1- 5%. Generally it is 1-3%(the 3rd most abundant constituents in the air)

Air quality and particles Epidemiological(流行病学) evidence associates atmospheric particles with diseases and mortality Particles penetrate the lungs, blocking and irritating aIr passages. Particles themselves could exert toxic effects. ( toxic substances present in the particles [polycyclic Aromatic Hydrocarbons are examples of toxic substances in aerosols.]

The atmosphere The atmosphere is a thin blanket of gas that envelops the earth The gases that make up the atmosphere are held close to the earth by the pull of gravity With increasing distance from the earth's surface, the temperature, density, and composition of the atmosphere gradually change

学习目的:掌握水质指标的基本概念和常见水 质指标。使学生了解分析化学是怎样的一门学 科,树立准确的量的概念。了解定量分析的过 程;误差的基本概念

一、本节知识结构 二、误差的概念、分类与表示法 三、随机误差的统计规律 四、少量数据的统计处理 五、误差的传递 六、回归分析法 七、提高分析结果准确度的方法 八、有效数字

目前执行的《水质化学需氧量的测定重铬酸钾法》(GB11914-89)不适用于含氯化物浓度 大于1000mg/L(稀释后)的废水,《高氯废水化学需氧量的测定氯气校正法》(HJ/T702001) 只适用于氯离子含量小于20000mg/L的高氯废水中COD的测定,一些行业和企业(如石油企业)排 放的工业废水中氯离子浓度高达几万至十几万毫克每升,高浓度氯离子对COD的测定造成严重的正 干扰,目前发布的监测方法无法准确监测这类废水中的COD,影响了环境执法和监督

反应过的/聚合过首先对材料进行试验,以决定其是否可用于当前生 的或不合规格 的化学品 粉尘排出物 将陈旧材料退还给供货商 空容器 加(运)油剩余物隔离废物流