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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 aim is to reduce the p H levels of the sample to a neutral level by continual rinsing.
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.
By increasing the rate of flow, one can increase the effect of the vacuum.
A glass filter is placed at the bottom of the funnel and dampened with distilled water (dist. Afterwards, the sample is placed on top of the filter paper and a number of litres of distilled water poured in and drawn through the sample by the vacuum effect.
Many samples from terrestrial environments, such as wood, charcoal and peat, will often contain small amounts of absorbed carbonates from percolating groundwater.
This material is non-contemporaneous and must be removed.
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