It is important to ensure that all of the carbonates (Ca CO3) have been completely removed so there is no further mass reduction prior to combustion of the sample.
Occasionally the lab receives samples identified as “pollen” but when viewed under the microscope consists of many components including sediment, fibers, and plant material. You only need to include the confirmation code in the package.
For example, a vegetation community composed of 15% x, 35% y and 50 % z may be represented in a deposit by approximately equal amounts of pollen from x, y and z, because of the inter-species differences in pollen productivity and dispersion.
To resolve this, it is necessary to have some function that relates pollen abundance and spatial distribution to species frequency.
Differences in pollen productivity and dispersion rates pose a significant problem for palaeoclimatic reconstruction because the relative abundances of pollen grains in a deposit cannot be directly interpreted in terms of species abundance in the study area.There are factors, however, which can affect pollen readings.Contamination of the site, as for example, the red dust that covered the country some years ago that had travelled many hundreds of miles, upsets a pollen sequence.In such cases, the lab will ask you to decide whether to proceed or cancel the analysis. If you proceed, the analyzed material will be listed in the results report as “organic material” and not “pollen”.