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This document considers liquid atmospheric precipitation and defines the procedures and equipment to perform laboratory and field tests, in steady-state conditions, for the calibration, check and metrological confirmation of liquid precipitation measurement instruments. It provides a classification of catching-type measurement instruments based on their laboratory performance. The classification does not relate to the physical principle used for the measurement, nor does it refer to the technical characteristics of the instrument assembly, but is solely based on the instrument calibration. Attribution of a given class to an instrument is not intended as a high/low ranking of its quality but rather as a quantitative standardized method to declare the achievable measurement accuracy in order to provide guidance on the suitability for a particular purpose, while meeting the user’s requirements.

This International Standard specifies methods of determining nanoparticle size and shape distributions by acquiring and evaluating scanning electron microscope images and by obtaining and reporting accurate results.

NOTE 1 This International Standard applies to particles with a lower size limit that depends on the required uncertainty and on the suitable performance of the SEM, which must be proven first -according to the requirements described in this document.

NOTE 2 This International Standard applies also to SEM-based size and shape measurements of larger than nanoscale particles.

This International Standard provides guidance on how to capture, measure, and analyse transmission

electron microscopy images to obtain particle size and shape distributions in the nanoscale.

NOTE This International Standard broadly applies to nano‐objects as well as to particles with sizes larger than

100 nm. The exact working range of the method depends on the required uncertainty and on the performance of

the transmission electron microscope, which must be evaluated according to the requirements described in this

document.

This document specifies a method for the detection, semi-quantitative and quantitative enumeration of thermotolerant Campylobacter species. The method can be applied to all kinds of waters including: drinking water, ground water and well water, fresh, brackish and saline surface water, swimming pools, spa and hydrotherapy pools, recreational waters, agricultural waters and runoff, untreated and treated wastewater and also sand and other sediments. This method can be used for the detection of Campylobacter species in a specified sample volume. Clean water samples may be membrane filtered for either a detection or most probable number (MPN) test. Water samples with higher turbidity, such as primary and secondary wastewater effluents and sediments, should be analysed using an appropriate detection or MPN method by direct inoculation of material into bottles or tubes. Sediments may be suspended in a suitable diluent or inoculated directly into enrichment broths. Users wishing to employ this method should verify its performance for the particular matrix under their own laboratory conditions.