BS ISO 12744:2006 pdf download.Copper, lead,zinc and nickel concentrates Experimental methods for checking the precision of sampling.
5.1 Interleaved samples
Each alternate primary increment shall be diverted so that pairs of interleaved samples A and B are formed. The number of divided increments per primary Increment should be the same as for routine sampling. An example of a sampling plan for producing pairs of interleaved samples A and B is shown in Figure 1.
5.2 Sample processing and analysis
The pairs of interleaved samples A and B taken in accordance with 5.1 shall be divided separately and subjected to method 1. method 2 or method 3 sample processing and analysis as described in 5.2.1, 5.2.2 or
5.2.3.
5.2.1 Sample processing method 1 (see Figure 2)
The two interleaved samples A and B shall be divided separately to prepare four laboratory samptes, A,, A.2. and B1. 82. These laboratory samples shall each be analysed in duplicate, and the duplicates designated x,,, and x,,2tor sample A,. X,2, and x,for sample A2, X2,l and x212tor sample B,, and x,j, and xmfor sample 82. The eight determinations shall be run in random order, by the same analyst on the same day using the same anatytical equment. An example is given in Annex A.
NOTE By using niethocl 1, the estimated precislors of primary sampling. samçle processsig and analysis can be oblained separatety.
5.22 Sample processIng method 2 (see Figure 3)
Sample A shall be divided to prepare two laboratory samples, A, and A2. From sample B. only one laboratory sample shall be prepared. The laboratory samples shall each be analysed in duplicate, and the duplicates designated x,,1 and x,12 tor sample A,. x,2, and XI for sample A2. and x and x22 for sample B. The six determinations shall be run in random order, by the same analyst on the same day using the same analytical equipment.
NOTE By using method 2, the estimated precisions of primary sampling, sample processing and analysis can be oblskied seperately. However, the estimated values will be less prease thai those obtained using method I.
Each alternate primary increment shall be diverted so that pairs of interleaved samples A and B are formed. The number of divided increments per primary Increment should be the same as for routine sampling. An example of a sampling plan for producing pairs of interleaved samples A and B is shown in Figure 1.
5.2 Sample processing and analysis
The pairs of interleaved samples A and B taken in accordance with 5.1 shall be divided separately and subjected to method 1. method 2 or method 3 sample processing and analysis as described in 5.2.1, 5.2.2 or
5.2.3.
5.2.1 Sample processing method 1 (see Figure 2)
The two interleaved samples A and B shall be divided separately to prepare four laboratory samptes, A,, A.2. and B1. 82. These laboratory samples shall each be analysed in duplicate, and the duplicates designated x,,, and x,,2tor sample A,. X,2, and x,for sample A2, X2,l and x212tor sample B,, and x,j, and xmfor sample 82. The eight determinations shall be run in random order, by the same analyst on the same day using the same anatytical equment. An example is given in Annex A.
NOTE By using niethocl 1, the estimated precislors of primary sampling. samçle processsig and analysis can be oblained separatety.
5.22 Sample processIng method 2 (see Figure 3)
Sample A shall be divided to prepare two laboratory samples, A, and A2. From sample B. only one laboratory sample shall be prepared. The laboratory samples shall each be analysed in duplicate, and the duplicates designated x,,1 and x,12 tor sample A,. x,2, and XI for sample A2. and x and x22 for sample B. The six determinations shall be run in random order, by the same analyst on the same day using the same analytical equipment.
NOTE By using method 2, the estimated precisions of primary sampling, sample processing and analysis can be oblskied seperately. However, the estimated values will be less prease thai those obtained using method I.
