TPO-1 Certificate of Analysis
Certified Reference Material: Iron Sulphide Concentrate and Tailings
Printable version of the certificate (PDF, 136.21 kb)
First issued: September 2004
Version: January 2010
|Between- Labs Standard
|95% Confidence Limit|
TPO-1 is a mixture of iron sulphide concentrate and tailings from the Clarabelle Mill that was originally prepared as a custom certified reference material for Inco Limited, Copper Cliff, Ontario, Canada in 1998. Inco agreed to donate some of the custom certified reference material to Natural Resources Canada.
The raw material was dried at 60°C for 30 hours, crushed, sieved, and blended to obtain a minus 150 micron (100 mesh) product. The yield was 86%. The material comes in glass bottles containing 25-30g each. This is the only size available. Each bottle was sealed under nitrogen in a laminated aluminum foil-mylar pouch to prevent oxidation.
TPO-1 is suitable for the analysis of elements at major, minor and trace levels. Examples of intended use are for quality control in the analysis of samples of a similar type, method development, arbitration and the calibration of equipment.
Instructions for use
The assigned values pertain to the date when issued. TPO-1 should be used “as is”, without drying. The contents of the bottle should be thoroughly mixed before taking samples. The contents of the bottle should be exposed to air for the shortest possible time. After opening the sealed pouch, the bottle should be kept in a desiccator, or preferably, resealed under nitrogen in a new heat-sealed laminated foil pouch to prevent oxidation.
Normal safety precautions such as the use of safety glasses, breathing protection for fine particulate matter, gloves and a laboratory coat are suggested.
Level of homogeneity
The homogeneity of the stock with respect to its copper, nickel and sulphur was investigated using twenty-two bottles chosen according to the bottling sequence and a stratified random sampling scheme. Two splits were analysed from each bottle. The analyses for copper, nickel and sulphur were performed. The method used for the analysis of copper and nickel was digestion of a 0.5g-sample with hydrochloric, nitric, hydrofluoric and perchloric acids followed by determination by atomic absorption spectroscopy. The method for the analysis of sulphur was combustion on a 0.5 g sample using a combustion apparatus with infrared detection.
A one–way analysis of variance technique (ANOVA) was used to assess the homogeneity of these elements (Footnote 1). The ratio of the between-bottles to within-bottle mean squares is compared to the F statistic at the 95% level of probability. No evidence of inhomogeneity was observed for all three elements. Use of a smaller mass will invalidate the use of the certified value and associated parameters.
Eighteen governments, industrial and commercial laboratories participated in the interlaboratory measurement program. Cobalt, copper, iron, nickel and silicon were analyzed by methods of each laboratory's choice. Methods included multi acid digestions, fusion, electroplating, atomic absorption spectroscopy, combustion, titration, gravimetric methods, x-ray fluorescence and inductively coupled plasma – atomic emission spectroscopy. A one-way analysis of variance technique (ANOVA) was used to estimate the consensus value and other statistical parameters (Footnote 1). Table 1 contains the means and associated statistical parameters for the six certified elements.
Table 2 contains the informational values derived from semi-quantitative analysis.
The certified values quoted herein are based on the consensus value derived from the statistical analysis of the data from the interlaboratory measurement program.
Date of certification
TPO-1 was certified in 1998 for Inco Limited. In 2004 the material was added to the inventory and a certificate was issued. The September 2004 version of the certificate was re-issued in January 2010 with no changes due to the expiration of the former.
Period of validity
These certified values are valid until January 31, 2032. The stability of the material will be monitored every two years. Updates will be published on the CCRMP web site.
CanmetMINING has prepared this reference material and statistically evaluated the analytical data of the interlaboratory certification program to the best of its ability. The purchaser, by receipt hereof, releases and indemnifies CanmetMINING from and against all liability and costs arising out of the use of this material and information.
Maureen E. Leaver – CCRMP Coordinator
Joseph Salley – Data Processor
For further information
555 Booth Street
Ottawa ON K1A 0G1
E-mail: Contact CCRMP
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