Take necessary precautions

Also known as DCM or dichloromethane. Often used as an adhesive solvent for acrylics. Pure DCM can be found in craft stores. DCM must be distilled first from all non-flammable paint strippers beforehand (they contain a paste that holds several unwanted substances.) The paint stripper may also contain methanol (most marine grade paint strippers are 80-90% DCM. Methanol is also an organic solvent. DCM distills at 47° C or 116° F. Pure DCM is best. May cause cancer and blindness. Take necessary precautions. Methylene chloride sinks to the bottom of the jar. 

Because of the extreme toxicity of these compounds, the analyst must take necessary precautions to prevent exposure of personnel to materials known or believed to contain PCDDs/PCDFs. 

Most of the nonoccupational data on exposure to erionite refer to an agricultural area of Central Anatolia, Cappadocia, Turkey. Limited data are available from the USA, suggesting little exposure to fibers. People and animals must be prevented from contacting erionite responsible person/group should take necessary precaution and must not permit people work or live in an area contaminated with erionite. 

Everyone involved in welding operations must take necessary precautions to prevent fires, explosions, or personal injuries. Even for small or routine jobs, you should always follow established safety procedures and resist the temptation to take shortcuts. 

Safety Guidelines It is vital that you take necessary precautions in the organic chemistry laboratory. 

Locate all public services, water, gas, electricity, telephone, sewers etc., and avoid if possible if not, take necessary precautions. 

Failure to take necessary precautions agcunst predictable accidents and occupational illnesses makes management and workers morally responsible for those accidents and illnesses. 

When HM/TDG are present, take necessary precautions with leaks, spills or unsecured cargo. 

The Plan Coordinator will determine if anyone has been injured and take necessary precautions. He/She will notify (enter name of hospital) if appropriate. 

To avoid loss of analyte by chemical reaction or by temperature or bacterial effects, it may be necessary to take extraordinary precautions specific to the analyte itself. Such precautions may include adding a preservative to the sample, maintaining specific conditions of temperature, humidity, or other environmental conditions, avoiding sunlight or oxygen, etc. In addition, laboratory equipment that comes into contact with the sample in the preparation process should be clean and free of material that would remove analyte or add contaminant. 

Apparatus The introduction of sample(s) may be accomplished by using airtight syringes and a simple conventional gas chromatograph. Nevertheless, the equilibrium has got to be carried out in a separate chamber and the vapour phase is subsequently conveyed to the column taking necessary and every possible precautions so as to avoid any minute changes in the equilibrium. 

To achieve this goal, top management must delegate authority, as necessary, to all management and supervisory levels. Supervisors in turn, as advised by the health officer, must accept and interpret the policy and actively support it. A supervisor, for example, must ensure that each of his or her employees understands the properties and hazards of any material that is handled, stored, or used by them, and takes all necessary precautions and follows established work procedures. An employee must make an effort to be aware of the hazards associated with toxic materials and follow the procedures laid down for their handling. 

In case of accidents, immediately take the necessary precautions to reduce the harm. This is usually by washing the affected area thoroughly with soap water or running tap water. 

The presence of a certain excess of base prevents the conversion of the hypochlorite into chlorate and chloride, whereas it is rapidly effected when the acid is in excess. It is therefore necessary to add the acid to the alkaline substance in quantity insufficient for saturation, and constantly to agitate the bottle immersed in cold water and not to reverse the operation by gradually saturating the acid with the base. By taking these precautions, cone. soln. of hypochlorous acid and potash may be used without precipitating potassium chlorate, notwithstanding the sparing solubility of this salt. This proves that u any chlorate is formed, the quantity is very small. 

It is important to observe in this process that the mcasuro in which the developer is mixed Bhould be chemically clean it ought, therefore, to be cleansed with cyanide of potassium, and well washed after every picture. In the ordinary wet process it is not absolutely necessary to take this precaution, although it is well to do so. The nitrate of silver added to the developer should be fresh solution, and not taken from the nitrate-bath. 

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