Paints and varnishes. Determination of release rate of biocides from antifouling paints. Part 4: Determination of pyridine-triphenylborane (PTPB) concentration in the extract and calculation of the release rate (ISO 15181-4:2008)
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ISO 15181-4:2008 specifies the apparatus and analytical method for determining the amount of pyridine-triphenylborane (PTPB) that has been released from an antifouling paint into artificial seawater in accordance with the procedure given in ISO 15181-1. It determines the PTPB concentration in the artificial seawater extract and gives the final calculation for the release rate of PTPB under the specified laboratory conditions. This part of ISO 15181 is designed to allow the concurrent determination of PTPB and other biocides that can be released by a given antifouling paint (for example, zineb) through the analysis of separate sub-samples of an artificial seawater extract generated in accordance with the procedure given in ISO 15181-1. When used in conjunction with ISO 15181-1, the practical limits on the quantitative measurement of release rates by this method are from 1,8 micrograms per square centimetre per day to 500 micrograms per square centimetre per day. The quantitative measurement of release rates below this range will require an additional concentration step described in the text or the use of an analytical method with a lower limit of quantitation for PTPB in artificial seawater.
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Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Supplementary information
5 Apparatus
6 Reagents and materials
6.1 Cleaning reagents.
7 Test samples
8 Procedure
8.1 General
8.2 Sample treatment
8.3 Preparation of PTPB stock solution
8.4 Preparation of calibration standards
8.5 Preparation of chromatography eluent
8.6 Instrument calibration
8.7 Sample determination
9 Calculation and expression of results
9.1 Calculation of the PTPB concentration
9.2 Release rate for each test cylinder
9.3 Mean release rate for each set of three cylinders
9.4 Cumulative PTPB release
9.5 Mean PTPB release rate
9.6 Pseudo-steady-state mean PTPB release rate
10 Validation of the method
11 Test report
Annex A Supplementary information (normative)
Annex B Additional information on PTPB (informative)
ASTM D 6442:2006 Standard Test Method for Determination of Copper Release Rate From Antifouling Coatings in Substitute Ocean Water
ISO 15181-1:2007 Paints and varnishes -- Determination of release rate of biocides from antifouling paints -- Part 1: General method for extraction of biocides
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ASTM D 6442:2006 Standard Test Method for Determination of Copper Release Rate From Antifouling Coatings in Substitute Ocean Water
ISO 15181-1:2007 Paints and varnishes -- Determination of release rate of biocides from antifouling paints -- Part 1: General method for extraction of biocides
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods