Friday, 15 July 2016

Control of Substance with Specific Effects:

CARCINOGENS:

Carcinogens are substances that have been identified as having the ability to cause cancer. Examples of these include arsenic, hardwood dusts and used engine oils.

GENETIC DAMAGE:

Substances known as mutagens have been identified that cause changes to DNA, increasing the number of genetic mutations above natural background levels. These changes can lead to cancer in the individual affected or be passed to their offspring's genetic material, for example thalidomide and plutonium oxide.

Due to the serious and irreversible nature of cancer and genetic changes, an employer's first objective must be to prevent exposure to carcinogens and mutagens. These substances should not be used or processes carried out with them, if a safer alternative less hazardous substance can be used instead. Where this is not feasible suitable control measures should include:

  • Totally enclosed systems.
  • Where total enclosure is not possible, exposure to these‐substances must kept to as low level as possible through the use of appropriate plant and process control measures such as handling systems and local exhaust ventilation (these measures should not produce other risks in the workplace).
  • Storage of carcinogens/mutagens must be kept to the minimum needed for the process, in closed, labelled containers with warning and hazard signs, including waste products until safe disposal.
  • Areas where carcinogens/mutagens are present must be identified and segregated to prevent spread to other areas.


OCCUPATIONAL ASTHMA:

Occupational asthma is caused by substances in the workplace that trigger state of specific airway hyper responsiveness in an individual, resulting in breathlessness, chest tightness or wheezing. These substances are known as asthmagens and respiratory sensitizers. 

Exposure to these substances should be prevented, and where that is not possible, kept as low as reasonably practicable.

Control measures used should take account of long term time weighted averages and short term peak exposures to the substance. If an indiv dual develops occupational asthma, their exposure must be controlled to prevent any further attacks. Workers who work with asthmagens must have regular health surveillance to detect any changes in respiratory function.

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