BS 4938-2:1982

Foreword
Cooperating organizations
Method
0 Introduction
1 Scope
2 Definitions
3 Principle
4 Reagent
5 Apparatus
6 Preparation of test sample
7 Procedure
8 Expression of results
9 Test report
Appendices
A Information on the relationship between results
   obtained by the reference method described in
   BS 4938 : Part 1 and the rapid method
B Information on the preparation of the photographic
   standard filter discs
C Method for assessing the suitability of filter
   material
D Bibliography
Table
1 Composition of coarse and fine dirt
Figures
1 Layout of a suitable filtration apparatus
2 Photographic standard filter discs showing mass, in
   milligrams, of visible dirt (fine) per litre of milk
3 Photographic standard filter discs showing mass, in
   milligrams, of visible dirt (coarse) per litre of
   milk

Method, for use in field or laboratory conditions, involving rapid filtration of a test portion and comparison of filtered visible dirt with two sets (coarse and fine) of photographic standards (see BS 4938:Part 2P). An appendix gives information on the relationship between results obtained using methods described in Parts 1 and 2.