Acidification Environmental Standards

UKTAG requested Freshwater Task Team to develop acidification environmental standards based on new biological methods and additional evidence that has become available since the last round of standard setting in 2006. This paper describes the proposed standards and the process followed for their derivation.

The original pH standards were based on expert judgement from published pressure response relationships. In this round the standards have been established to protect the biological conditions set through the UK’s Inter-calibrated procedure, and recent publications which explore the range of pressures that arise from acidification.
The process followed is outlined below:
 Devise a relevant typology.
 Establish biological class boundaries- achieved through inter-calibration.
 Gather supporting evidence from the literature.
 Establish pressure response relationships
 Derive standards
 Assess implications of changes
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