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Please contact us if you want to analyze microgram samples or individual organic compounds and if you have questions regarding sample amount, sampling or packing.top Please email the data sheet and table to: [email protected] At the start of sample processing, each organic sample and most carbonate samples are inspected under a light microscope where recognizable organic fragments (charcoal, wood, seeds, leaves, pollen, etc.) are selected for dating and contaminants such as rootlets, clothing fiber or hair are removed.
The AAA extraction often produces two fractions: (i) the alkali residue (humin), free of the mobile contaminants, which (often) will yield a reliable sample age upon radiocarbon dating and (ii) the humic acid fraction, which may contain contaminating, soluble organic components.The pre-treatment procedures, used for different sample types, are explained below.Our chemical pre-treatment of organic samples is based on the familiar acid-alkali-acid (AAA) cleaning with diluted hydrochloric acid and sodium hydroxide, which is commonly used in radiocarbon laboratories.The procedure yields two fractions: (i) the collagen, the fraction preferred for dating, and (ii) the acid- and water-insoluble organic bone material. Again, the size of the age discrepancy between the two dates provides an indication of the reliability of the (collagen) sample age.top on an iron catalyst in a modular reduction system with 28 units on three lines as shown in the figure on the left.