The design and operation of the UK National Marine Analytical Quality Control Scheme is described. The Scheme was in operation for four years up to 1996, when more formal links with the QUASIMEME programme were established. The results of inter-laboratory tests for the determination of nutrients in water samples and metals, organic compounds in waters, sediments and biological samples are summarized.

The approach to analytical quality control adopted for the UK National Marine Analytical Quality Control Scheme is described. The Scheme began in 1991 and is in its fifth year of operation. The aim of the programme of work is to ensure adequate control over the accuracy of analysis, such that the aims of the UK National Marine Monitoring Plan are satisfied. The results of interlaboratory tests for the determination of nutrients in water samples and metals, organic compounds in waters, sediments and biological samples are summarised.