OR/16/028 Appendix 2

Beriro, D J, Field, L P and Cave, M R. 2016. Validation of a gravimetric PM2.5 impactor using particle sizing techniques. British Geological Survey Internal Report, OR/16/028.

Characterisation report

Title:	Particle Size Analysis of Limestone Dust
Company:	British Geological Survey
Company Address:	Nicker Hill, Keyworth NG12 5GG
Company Contact:	Dr Darren Beriro
Quotation Reference:	PC-16-079
Sample Receipt Date:	18 March 2016
Date of Report:	23 March 2016
Laboratory Address:	Unit 1 Biolncubator, Garstang Building, University of Leeds, Leeds, LS2 9JT
Prepared by:	Lucile Chan	Signed:	-&
Job Title:	Scientist	Date:	<X4 "'-1Of J.DI6 ·
Checked by:	Paul Senior	Signed:	Pws._
Job Title:	Scientist	Date:	'.24- ('(\.C'>.J 2ol-b
Approved by:	Kylie Griffin	Signed:	we_
Job Title:	Quality Manager	Date:	.2.4- 11'\AQ. .2..ol 6

The particle size analysis by laser diffraction carried out in this report has been UKAS accredited to comply with ISO/IEC 17025:2005. The scope of this accreditation does not cover any opinions or interpretations stated.

escubed limited, Leeds Innovation Centre, 103 Clarendon Road, Leeds, LS2 9DF. UK.
Registered in England and Wales No: 6295505
VAT No: 933840713
RT003-2 Malvern Mastersizer Wet Analysis Report

CONFIDENTIAL

This report is issued with the conditions of business of escubed limited and relates only to the sample(s) tested.

Summary

Table 1    Summary of Results

escubed ID	Client Sample ID	Particle Size (μm)
		Dv (10)	Dv (50)	Dv (90)
16-079-01	BA-OS-ALL-150316	1.07	4.01	10.67

Introduction

One sample of limestone dust was submitted for particle size analysis using the Malvern Mastersizer 3000. A summary of results is given in Table I.

Methodology

Particle size analysis

The work was carried out using a Malvern Mastersizer 3000 with the Hydro MV dispersion cell. The dispersion cell was filled with de-ionised water and thermal equilibrium allowed to take place before checking the cleanliness of the system. Once clean, a background was determined, the laser aligned and a background measurement taken. The following settings and requirements were used for the analysis:

Method Reference	INS-SOP002-3
Dispersion Cell	Hydro MV
Dispersant	Purified water
Surfactant	5% v/v Igepal CA-630 in water
Background Sweep	20 seconds
Measurement Time	10 seconds
Number of Measurements	10
Stirrer/Pump Speed	2700 rpm
Obscuration	4–5%

Optical properties

The scattering pattern was deconvolved (to produce the particle size distribution) using Mie theory. Mie theory requires knowledge of the refractive index of both sample and the dispersant along with the absorption (imaginary refractive index) of the sample.

Refractive Index	1.59
Imaginary Refractive Index	1
Refractive Index of Dispersant	1.33
Analysis Model	General Purpose (Normal Sensitivity)
Particle Shape	Non-Spherical

The result is presented as a mean based volume result in µm of the repeat measurements taken. The result has been represented by the 10th, 50th, and 90th percentiles Dv (10), Dv (50) and Dv (90).

Results

Particle size analysis

The analysis reports for the samples are included in the appendix; showing the mean result of the repeat measurements taken.

Table II show the Dv (10), Dv (50) and Dv (90) for the sample together with the standard deviation and coefficient of variation (%CV), which show the repeatability between measurements. It is stated in ISO 13320 that the %CV should not exceed 3% around the median and 5% around the extremities. Below 10µm, these maximum values should be doubled.

Table 2    Repeatability of BA-OS-ALL-150316 (ID 16-079-01)

Sample Name	Particle Size (µm)
	Dv (10)	Dv (50)	Dv (90)
16-079-01 BA-OS-ALL-150316 Rep 4	1.06	3.98	10.73
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	3.99	10.72
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	4.00	10.74
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	4.01	10.77
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	4.02	10.71
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	4.02	10.64
16-079-01 BA-OS-ALL-150316 Rep 4	1.07	4.02	10.66
16-079-01 BA-OS-ALL-150316 Rep 4	1.08	4.02	10.62
16-079-01 BA-OS-ALL-150316 Rep 4	1.08	4.03	10.58
16-079-01 BA-OS-ALL-150316 Rep 4	1.08	4.03	10.55
Average	1.07	4.01	10.67
Standard Deviation	0.00	0.02	0.07
%CV	0.41	0.40	0.70

Appendix