During this treatment, regular litmus readings are taken to determine the extent of the acidity remaining.
Once the p H level is reduced, two sample fractions are left; an acid insoluble fraction and an acid soluble fraction.
The final acid wash ensures that any such contamination is removed.
The insoluble fraction usually contains the sample minus the contaminant and is the dateable component.
So yeah this is a big fuck you to this website and only reason I'm living my account here is 'cause the only one good thing about this place are the way you categorize your shows and see the percentage of stuff you watch.
Nevertheless, it’s totally bananas the rest of the way...far. When I click onto some of the links, it goes to a blank page or a malware box pops up and won't take me to the link!There are two major decay contaminants; humic acids and fulvic acids.The humic fraction is acid insoluble and is removed using a base extraction method.The fulvic fraction however, is soluble in acid and may be removed using an HCl wash.The most common method of treating samples thought to be contaminated with these substances is the acid-base-acid method (ABA), sometimes called the acid-alkali-acid (AAA) method.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 acid insoluble fraction should contain the original, pristine sample, minus the carbonate contaminants, if the acid wash has had its desired effect.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.It is then rinsed in a buchner funnel with distilled water to reduce the p H levels towards neutral.It is added to the sample in a beaker which is placed on a hot plate and heated until slowly boiling.After approximately one hour it is removed and placed into a buchner funnel.