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The samples most often given solvent pretreatments such as this are wood, soil organics, peat and charcoal, from specific environments.

After being physically pretreated and reduced in size, the sample is washed in hot diluted (10%) HCl in a beaker for approximately one hour, or until the reaction appears to have ceased.The insoluble fraction usually contains the sample minus the contaminant and is the dateable component.Sometimes, samples undergo a solvent extraction prior to ABA pretreatment to remove contaminants such as resins and waxes.Once the p H level is reduced, two sample fractions are left; an acid insoluble fraction and an acid soluble fraction.The soluble fraction should contain the carbonate contaminants and as such is seldom used for dating purposes, except when there is a need to know the age and nature of the contamination.The Na OH treatment produces two fractions, base soluble and insoluble.The former may be kept for dating purposes by being acidified, rinsed and dried in an oven.Usually, dilute HCl (10% conc.) is used in this treatment.It is added to the sample in a beaker which is placed on a hot plate and heated until slowly boiling.It is then rinsed in a buchner funnel with distilled water to reduce the p H levels towards neutral.Following this, the sample is immersed in a 5% diluted, boiling Na OH solution for approximately one hour, after which it is rinsed or centrifuged again.

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