tailieunhanh - Inorganic Constituents and Aesthetic Parameters

It is possible also that sprezzatura may be set in an organisational context. In terms of modern imagery within organisations, there may be similarities of context between a sixteenth century court and a twenty first century court, or organisation. In external terms, the version today lacks the overt ostentation of the earlier one in terms of furnishings, dress and ceremonials. Today the ambitious junior employee, conscious of the bases of power in a modern organisation, may exert by selective exercise of the Laws of Power heightened personal influence to achieve promotion and power. The process could be summarised. | Inorganic Constituents and Aesthetic Parameters Session Objectives To describe the process of setting Guideline Values for inorganic parameters and describe the narrow divide between toxic and essential elements. To describe some basic physico-chemical characteristics of water. To provide some examples of inorganic chemicals to illustrate the uses of GVs for inorganics and highlight priority substances. To describe the basis of monitoring of physical and chemical parameters. WHO SEMINAR PACK FOR DRINKING-WATER QUALITY Inorganic Constituents and Aesthetic Parameters All substances are poisons there is none which is not a poison. The right dose differentiates a poison and a remedy. PARACELSUS 1493-1541 Introduction Many of the inorganic and aesthetic constituents evaluated in the Guidelines are known to be essential for life. Chromium copper fluoride iodine manganese molybdenum and selenium are essential elements in human nutrition arsenic and nickel are considered by some researchers as essential elements. Of the aesthetic constituents iron chloride calcium and magnesium hardness sodium and zinc are essential elements. A classification into essential and toxic elements is fraught with difficulties since as science advances there is a constant shift of the elements from one group to the other. Toxicity is inherent in all elements and is a function of the concentration to which humans are exposed. Paracelsus statement remains valid The right dose differentiates a poison and a remedy . Ordinary salt calcium magnesium and iron are all toxic above certain doses. This is illustrated in Figure 1 below. The plateau of safe and adequate intake of essential elements are mainly a matter for nutritionists to decide. Dose Figure 1. Dose-response curve Source Galal-Gorchev 1995 Aotes. NOAEL no observed adverse effect limit LOAEL lowest observed adverse effect limit Threshold chemicals only toxic above certain dose therefore have a NOAEL Non-threshold chemical toxic at any dose .