产品详细介绍

NBM-1Acid Base Accounting Material

Table 1 - NBM-1 certified values
Test Units Mean Between-
Labs SD Within-
Lab SD 95% confidence interval of mean
AP-MS kgCaCO3/t 8.48 0.95 0.44 ±  0.57
AP-S kgCaCO3/t 8.73 0.81 0.35 ±  0.35
Paste pH pH 8.45 0.11 0.04 ±  0.05
S % 0.28 0.03 0.01 ±  0.01 
Table 2 - Acronyms for acid base accounting tests
Sobek and modified Sobek methods
AP Acid potential
NP Neutralization potential
S Sobek method
MS Modified Sobek method
m Moderate fizz rating
s Slight fizz rating 
Table 3 - NBM-1 method-specific values
Test Units Mean Between-Labs SD Within-
Lab SD 95% confidence interval of mean
NP-S-m kgCaCO3/t 72.1 8.5 2.1 ± 10.7
NP-S-s kgCaCO3/t 49.6 3.0 1.8 ± 1.9 
Table 4 - NBM-1 informational values
Test Units Mean SD
NP-MS-m kgCaCO3/t 52.3 1.4
NP-MS-s kgCaCO3/t 46.6 10.1
S(SO4) % 0.02 0.002 
Table 5 - NBM-1 informational values for analytes
Analytes Units Mean SD
Al % 7.86 0.09
Ba % 0.117 0.001
C % 0.79 0.08
C (CO3) % 0.50 0.18
Ca % 2.30 0.02
Fe % 4.09 0.03
K % 2.36 0.18
Loss on ignition % 3.45 0.33
Loss of moisture % 0.32 0.02
Mg % 1.39 0.02
Mn % 0.046 0.001
Na % 2.70 0.13
P % 0.10 0.00
Si % 28.47 0.10
Ti % 0.335 0.006
Source
The raw material used to prepare NBM-1 was a biotic altered feldspar porphyry non-ore grade pit rock from the Bell Mine in Granisle, British Columbia and was donated by Noranda Minerals Incorporated.
Description
Major species in NBM-1 include sodium-plagioclase (30.7%), orthoclase (27.9%), quartz (21.8%), biotite (6.7%), kaolinite (3.7%), hematite plus magnetite (3.9%), siderite (2.5%), and ankerite (1.5%). Minor species include chalcopyrite (0.3%), and calcite, apatite, bornite, pyrite, and rutile, each with a concentration of 0.2%. Also, it was estimated visually that the weight ratio of hematite to magnetite is about 3:1.
Intended use
NBM-1 is suitable for the analysis of rocks for sulphur and various static prediction tests for acid base accounting by the Sobek and modified Sobek methods. Examples of intended use are for quality control in the analysis of samples of a similar type, method development, environmental assessment and the calibration of equipment.
Instructions for use
NBM-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 time possible. Unused material should be stored under an inert gas in a desiccator, or in a new, heat-sealed laminated foil pouch. The values herein pertain to the date when issued. CANMET is not responsible for changes occurring after receipt by the user.
Handling Precautions
Normal safety precautions for handling fine particulate matter are suggested, such as the use of safety glasses, breathing protection, gloves and a laboratory coat.
Method of Preparation
The raw material was crushed, ground, and sieved to separate a minus 74 µm fraction which was blended. The yield was 86%. The product was bottled in one size, 100-gram units. Each bottle was sealed under nitrogen in a laminated aluminum foil-mylar pouch to prevent oxidation.
Homogeneity
The homogeneity of the stock with respect to iron and sulphur was investigated using twenty-two bottles chosen according to a stratified random sampling scheme. Two splits were analysed from each bottle for both elements. Samples of 0.25 g were analysed for sulphur using a combustion analyzer. For iron analysis, samples of 1.25 g were digested with four acids and a titration was performed with potassium dichromate after a stannous chloride reduction. Use of a smaller sub-sample will invalidate the use of the certified values and associated parameters. A one–way analysis of variance technique (ANOVA) was used to assess the homogeneity of these elements. The ratio of the between-bottles to within-bottle mean squares was compared to the F statistic at the 95% level of probability. No evidence of inhomogeneity was observed for either element.