UL 83:2001 pdf download Water quality – Determination of adsorbable organic halogen – Ion chromatography method
1.1 Subject content
This Standard specifies ion chromatography method that determines adsorbableorganic halogen (AOX) in water.
1.2 Scope
This Standard applies to determine adsorbable organic halogen (AOX) in water andpolluted water,including adsorbable organic chlorine (AOCI)，adsorbable organicfluorine(AOF) and adsorbable organic bromine (AOBr).
When sample volume is between 50 and 200 ml, it can determine that theconcentration range of adsorbable organic chlorine (AOCI) is 15~600 ug/L, theconcentration range of adsorbable organic fluorine (AOF) is 5-300 g/L, and theconcentration range of adsorbable organic bromine (AOBr)is 9~1200 ug/L.
1.3 Interference and elimination
1.3.1 lnorganic halogen ion in water, during the sample enrichment process, also canpartly remain in activated carbon to interfere the determination. Use 20 ml of washingiquid of acidic sodium nitrate (4.12) to leach the activated carbon adsorption column.so that the interference can be eliminated entirely.
1.3.2 When there are insoluble chloride and biological cells (such as microorganismand alga) etc. in the water sample, the determination result will be higher; use nitrate(4.9) to adjust the pH value to be within 1.5~2.0; analyze it after 8 h.
1.3.3 When there is active chlorine in the water sample, the determination result ofAOCl will be higher. Add 5 ml of sodium sulfite solution (4.8) immediately in 100 ml ofwater sample, after sampling.
2 Definitions
2.1 adsorbable organic halogen (AOX)
It refers to the total (calculated by Cl) of halogen elements (including fluorine, chlorineand bromine) which can be adsorbed by activated carbon and can be combined on the organic compound, under the conditions specified by this Standard
2.2 adsorbable organic chlorine (AOCI)
lt refers to the total of chlorine which can be adsorbed by activated carbon and can becombined on the organic compound, under the conditions specified by this Standard.
2.3 adsorbable organic fluorine (AOF)
lt refers to the total of fluorine which can be adsorbed by activated carbon and can becombined on the organic compound, under the conditions specified by this Standard.
2.4 adsorbable organic bromine (AOBr)
It refers to the total of bromine which can be adsorbed by activated carbon and can becombined on the organic compound, under the conditions specified by this Standard.
3 Method and principle
Use activated carbon to adsorb the organic halogen compounds in water; place theactive carbon that have adsorbed organics into high temperature furnace to burndecompose, and transfer into hydrogen halide (hydride of fluorine, chlorine andbromine); use ion chromatography method to separate and determine, after absorbedby alkaline solution.
4 Reagents and materials
Unless otherwise stated, when analyzing, distilled water free from organics andanalytically pure reagents complying with national standards shall be used.
4.1 distilled water free from organics: use glass distiller to distill deionized water thathas been filtered by activated carbon (4.2) column; distill it before using.
4.2 Activated carbon: analytically pure, 20~60 meshes.
UL 83:2001 pdf download
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