AOX determination in water with high content of salt or organic compounds according to DIN 38409 - H 22

Method:	Matrix	Application-No.:
SPE		302080

Substances:		AOX
Column:		CHROMABOND® AOX, 500 mg, 6 ml
Phase:		CHROMABOND® AOX
MN catalog number:		730111.AOX
Conditions:		Column conditioning: 5 ml methanol, then 10 ml dist. Water, the column should not run dry Sample application: Force or aspirate 100 ml of the original or diluted water sample (pH 1) through the column (3-5 ml/min.). The column should not run dry. Discard the eluted solution. Wash with 50 ml of a nitrate washing solution (dissolve 17 g NaNO3 in 100 ml dist. water, add 1.4 ml HNO3 (10 M), fill up with dist. water to 1000 ml; take off 50 ml and fill up with dist. water to 1000 ml;). Discard the eluted solution. Elution: Slowly force or aspirate 1 x 1 ml, then 1 x 4 ml methanol and 10 ml dist. water through the column. Collect eluted solutions in 100 ml measuring flask and fill up with dist. water to 100 ml. (We recommend to test the recovery with a standard solution. Is the recovery to low, an increase of elution solvent is recommended (2 x 5 ml methanol or 2 x 5 ml Methanol/ethyl acetate 1:1). If the sample has only a small contamination (conc. DOC < 500mg/l) the adsorbent weight in the cartridge can be reduced for a better recovery, i.e. with CHROMABOND AOX, 200 mg, 6 ml, Art.-Nr. 730 119.AOX)
Author(-s):		SPE department
Source:		MACHEREY-NAGEL
Keywords:		AOX; DIN 38409 - H 22; H 22

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