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Loss-on-Ignition Standard Operating Procedure

Page 1 of 5 Loss-on-Ignition Standard Operating Procedure LacCore, National Lacustrine Core Facility 11/11/2013 Contents Purpose .. 1 Equipment .. 2 Safety .. 2 Summary .. 2 Procedure .. 3 How to use the Lab Line L-C oven .. 5 How to use the Isotemp muffle furnace .. 5 Document History/References .. 5 Purpose Water, organic matter, carbonate mineral, and siliciclastic+diatom content are estimated by sequentially measuring weight loss in sediment core subsamples after heating at selected temperatures. A compositional profile can be generated rapidly and for very low cost. This profile is sufficient to develop a general sense of core stratigraphy and often is sufficient for correlation between cores. The results are accurate to 1-2% for organic matter and carbonate in sediment with over 10% organic matter. In clay- or diatom-rich sediment, the water of hydration is lost during the carbonate burn, resulting in errors of up to 5% for carbonate analyses (and false positive carbonate content in carbonate-free sediments).

Weight loss is measured after heating the samples overnight at 100ºC to remove water, at 550ºC for four hours to remove organic matter, and at ... Log into the Analytical database, click LOI Requests/QUEUE” and create a new record for each separate project you are working on. Fill in Expedition, lake, year and number of samples. ...

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