scope:

This Japanese Industrial Standard specifies the testing methods for the following volatile organic compounds in industrial water and waste water: dichloromethane, dibromochloromethane, tetrachloromethane (carbon tetrachloride), trichloromethane (chloroform), tribromomethane (bromoform), bromodichloromethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,1-dichloroethene (l,l-dichloroethylene), cis-1,2-dichloroethene (cis-1,2-dichloroethylene), trans-1,2-dichloroethene (trans-1,2-dichloroethy lene), tetrachloroethene (tetrachloroethylene), trichloroethene (trichloroethylene), 1,2-dichloropropane, 1,3-dichloro-1-propene, 1,4-dichlorobenzene (p-dichlorobenzene), dimethylbenzene (xylene), benzene, methylbenzene (toluene), chloroethylene (vinyl chloride monomer), 1,4-dioxane and formaldehyde.

NOTE 1 A list of target substances for respective analytical methods specified in this Standard is given in Annex G.

NOTE 2 Compounds indicated above with the common names in attached parentheses are hereafter referred to by their common names.

WARNING When handling hydrogen carrier gas, pay attention to the following 1) to 5) because hydrogen gas has inflammability and explosiveness (4 % in explosion mixture limit) when mixed with air.

1) Examine for leaks in the piping from the hydrogen supply source to the apparatus, using a leak detector, etc.

2) Check that the exhaust gas from carrier gas, septum purge gas, split gas, vacuum pump, etc. is exhausted to outdoors.

3) Check that there is no leakage from the connecting part of capillary column because an explosion may occur if hydrogen leaks into the gas chromatograph oven due to poor connection, damage, cracks or the like in the capillary column.

4) Check that the environment in which the apparatus is installed has sufficient ventilation. Hydrogen is lighter than air and tends to stay near the ceiling; therefore, a hydrogen detector should be installed near the ceiling so that an alert is issued in case of hydrogen leakage.

5) Close the main valve of hydrogen gas cylinder when the apparatus is not activated.

A hydrogen gas generator, which is safer than a gas cylinder because it stores less hydrogen than a gas cylinder and stops generating hydrogen in the event of power failure, should be used instead of a hydrogen gas cylinder as far as possible.