Data point was measured and reported as below the detection limit

Data reported was below the limit of quantitative detection which is calculated from the instrument detection limit (IDL, mg/L) in a formula where LQD (ug/L)= IDL*1000

no DL reported, these are low and probably <LQD=ND

The detection limit was not reported in the original document. The reported data values are low and may be around the limit of quantification which would render them non-detectable.

Precision

"estimated value" according to orig. ref.

The original reference listed this sample as an estimate

[Hg val. doubtful, no. same as Cu value]

The mercury value is in question because it is reported as the same value as copper

The total is lower than Corg.

When calculating carbon content by difference, the equation for total carbon is the sum of organic and inorganic carbon. This denotes that the total carbon reported value is below the value for the organic fraction which is not possible.

High values

high for this dataset

The reported value is abnormally high as seen in the data validation technique. It appeared as a high outlier.

Low values

low value, given in hard copy, no DL reported

The reported value is abnormally low as seen in the data validation technique. It appeared as a low outlier. The data were verified in the original reference (hard copy) and no detection limit was reported either.

Methodology

Calculated by difference from TotalC-Corg

When calculating carbon content by difference, the equation for total carbon is the sum of organic and inorganic carbon. This denotes that the inorganic carbon was calculated with this equation.

Reported value below limit of quantification (LOQ).  Analytical spike outside 85-115% recovery image.

The reported data were below the limit of quantification. An analytical spike was run and was outside of the acceptable limits.

Reported values are the mean of replicate analysis

The values reported are an average of the replicate analyses performed on the sample

Sample type

Ammonia as N mg/kg (ppm) dry wt.

Ammonia was measured for this sample as nitrogen in units of parts per million by dry weight

Completeness

no data

no data were reported in this document

no data in orig. database

no data were reported in the original database

s.d. =  1%

This sample had a reported standard deviation of 1%

Stds  2.1 ug/g

Standards were run for this sample, this standard was 2.1 ug/g.

orig. units in %?

There is a question on the original units and if they are in percent

original DB also questions this #

the comments in the original database question the value reported

original units in question

the original units reported for this sample are a concern

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