نتایج جستجو برای: indicator chemical
تعداد نتایج: 450704 فیلتر نتایج به سال:
The Occupational Safety and Health Administration believes chemical odor breakthrough is no longer an adequate, sufficient indicator for when workers should change chemical cartridges. Therefore, OSHA's 1998 revision to its respiratory protection standard, 29 CFR 1910.134, requires users of chemical cartridge respirators to implement a cartridge change schedule based on "objective information o...
A new acid -base indicator which is less hazardous and inexpensive is proposed. It is capable of d istinguishing between the acids and bases. Titrations were carried out to ensure that the proposed indicator yields quantitative results. The results of titrations were quite satisfactory. The indicator was giving a distinct sustained colour even in the case of weak base and weak acid titrations. ...
with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...
Background: Waste of health care centers is particularly important due to their major role in spreading various diseases and environmental pollution. Consequently, considering function of non-hazardous waste devices in hospitals seems vital. This study is aimed to assess function of non-hazardous non-incineration devices of waste in Kerman educational hospitals and Sirjan hospitals Material...
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