GB/T 21780-2008Particle size analysis -- Sedimentation analysis in the gravitational field -- Pipette method (English PDF)

Foreword

This standard is identical with DIN66115. 1983 "sedimentation particle size analysis of the gravitational field analysis pipette Law" (in German).

For ease of use, this standard, the following editorial changes.

--- Information about the standard editing instructions of the preamble;

"." --- With a decimal point instead of a comma as the decimal point, "";

--- Renumbered;

--- Renumbered comment;

--- Dynamic viscosity units to mPa · s, and the number of related equations were modified;

--- Based on other standards, settling velocity equation symbol equivalent diameter from dS to X;

--- Joined the "scope" and "Method Description" and other sections, while some of the text has been edited proofreading;

--- Increasing the normative references explanatory preamble;

--- The DIN66115. 1983 original German standard "other criteria" classification to "References";

--- The DIN66115. 1983 original German standard "evaluation case" categorized as "Appendix A";

--- The DIN66115. 1983 original German standard "formula symbol" classification to "Appendix B".

Appendix B of this standard is a normative appendix, Appendix A is an information appendix.

This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points.

This standard was drafted. Guangdong Entry-Exit Inspection and Quarantine of Liaoning.

1 Scope

This standard specifies the use of the gravitational field of settlement analysis - pipette method particle size analysis method.

This standard applies to regulations pipette Measurement dispersed in the liquid accumulated solids particle size distribution curve (in line with DIN66141 be), the settling velocity of the pipette device used equivalent diameter in the range of 1µm ~ 250µm.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

DIN323 Part 1 standard and the main value of the standard number of coefficients, the exact value, rounding value DIN12242 Part 1 for laboratory glassware can be replaced with a conical ground joint specification error connected DIN12336 laboratory glassware flat evaporating dish DIN12553 laboratory glassware with a tapered leading bidirectional parallel drilling Capacity DIN12690 laboratory glassware marked by pipette Class A and Class B DIN66111 particle size analysis of the gravitational field analysis theory Settlement Describe the principles of particle size analysis DIN66141

3 Principles and Methods Description