AS 2242.1.1-1979

1 - AS 2242.1.1-1979 INSTRUMENTAL METHODS FOR ANALYSIS OF MILK AND MILK PRODUCTS - DETERMINATION OF FAT IN WHOLE MILK - TURBIDIM
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - METHOD
7 - 1 SCOPE.
7 - 2 APPLICATION.
7 - 3 PRINCIPLE.
7 - 4 MATERIALS AND REAGENTS.
7 - 4.1 Materials.
7 - 4.2 Reagents.
7 - 5 APPARATUS.
7 - 6 PREPARATION OF SAMPLES FOR TESTING.
7 - 6.1 Condition.
7 - 6.2 Storage.
7 - 6.3 Provisions for Mixing.
7 - 6.4 Preparation.
8 - 7 CALIBRATION OF THE INSTRUMENT.
8 - 7.1 Basic Procedure.
9 - 7.2 Calibration Conformance Check.
9 - 7.3 Daily Check Test.
10 - 8 PROCEDURE FOR THE OPERATION OF THE INSTRUMENT.
10 - 9 REPORT.
10 - 10 REPEATABILITY.
11 - APPENDIX A - DETERMINATION OF THE FAT IN WHOLE MILK USING THE FOSS 'MILKO' TESTER MARK III
11 - A1 SCOPE.
11 - A2 APPLICATION.
11 - A3 PRINCIPLE.
11 - A4 MATERIALS AND REAGENTS.
11 - A4.1 Materials.
11 - A4.2 Reagents.
12 - A5 APPARATUS.
12 - A6 PREPARATION OF SAMPLES.
12 - A7 CALIBRATION OF THE INSTRUMENT.
12 - A8 PROCEDURE FOR OPERATION OF THE INSTRUMENT
12 - A8.1 Instrument Parameters and Components.
13 - A8.2 Routine Daily Inspection.
13 - A8.3 Electrical Checks- Zero and Shift Value.
15 - A8.4 Calibration.
15 - A8.5 Procedure for Making a Measurement
15 - A9 REPORT.
15 - A10 REPEATABILITY.
15 - ANNEX 1 TO APPENDIX A - ADJUSTMENTS TO OBTAIN MAXIMUM ACCURACY
15 - 1 GENERAL.
16 - 2 CHECK OF CALIBRATION.
18 - 3 READJUSTMENT OF THE INSTRUMENT.
20 - ANNEX 2 TO APPENDIX A - CALCULATIONS RELATING TO INSTRUMENT CALIBRATION
20 - 1 CALCULATION OF NUMBER OF DETERMINATIONS FOR EQUIVALENT PRECISION.
22 - 2 CALCULATION OF THE PERMITTED DIFFERENCE BETWEEN THE RESULTS OBTAINED BY THE ‘MILKO’ TESTER MARK III AND THE SELECTED REFERE
23 - 3 CALCULATION OF THE CALIBRATION STATISTIC

Describes a general method for the instrumental analysis of fat in whole milk using a turbidimetric technique and which stipulates measures for the preparation of samples for testing instrument calibration and the procedure for operation. An appendix describes the detailed determination using the Foss 'Milko' Tester Mark III and provision exists for the addition of further appendices as other instruments gain acceptance.

This standard describes instrumental methods based on a turbidimetric principle for determining the fat in whole milk.NOTE: A particular method using a specific instrument, i.e. Foss 'Milko' Tester Mark III, is given in Appendix A. Provision exists for the progressive addition of further similar appendices relating to other instruments.

Reconfirmed 1993