The aim of this work was to demonstrate the performance of Whatman™ Grade 40 and Grade 41 quantitative ashless filter paper in specific mining industry applications. Whatman™ Grade 40 and Grade 41 filter paper was evaluated in three metal content tests typically used in quality control laboratories—high molybdenum, lead, and zinc analyses. Whatman™ Grade 40 and Grade 41 quantitative ashless filter paper met the customer’s requirements for filtration speed, clarity, and metal content in all tests. These requirements were achieved because these quantitative filter papers are manufactured to strict specifications that are important to mining industries. The data presented here show the suitability of Whatman™ Grade 40 and Grade 41 filter paper for these three analyses.
In mining industries, analytical quality control (QC) laboratories routinely test the content of different metals in ore samples. Sample preparation is a critical factor in obtaining consistent results. Therefore, the use of high-quality, dedicated filter paper is expected to improve the accuracy of these metal content tests. Whatman™ quantitative filter paper from Cytiva is made from pure cotton and treated to wash away most of the impurities. Whatman™ quantitative paper is useful for gravimetric analysis and the preparation of samples for instrumental analysis. Compared with other papers, Whatman™ quantitative ashless filter paper (Figure 1) gives high loading capacity and particle retention, both of which are useful for the analysis of metals and other substances in ore samples.
Figure 1.Whatman™ Grades 40 and 41 quantitative ashless filter paper
The performance of quantitative filter paper is important in high molybdenum (Hi Mo) testing. The major critical to quality (CTQ) factors in performance testing are filtration speed, clarity of filtrate, and molybdenum (Mo) content. Analyses were performed on ten samples using Whatman™ Grade 40 paper and the following procedure.
Figure 2.Retention of lead molybdate precipitate using Whatman™ Grade 40 filter paper.
The performance of quantitative filter paper is important in lead analysis, which is one of the major applications in mining industries. The major critical to quality (CTQ) factors in performance testing are filtration speed, clarity, and lead (Pb) content. Analyses were performed on ten samples using Whatman™ Grade 40 quantitative filter paper and the following procedure. The results were compared with the benchmark requirements.
The results for ten samples of Whatman™ Grade 40 quantitative ashless filter paper used in high molybdenum and lead analyses are presented in Tables 1 and 2, respectively. A consistent filtration speed and performance was obtained in both analyses. The customer is satisfied with the performance of Whatman™ Grade 40 filter paper in high molybdenum and lead analyses.
The results for ten samples of Whatman™ Grade 41 quantitative ashless filter paper used in zinc analysis are provided in Table 3. Consistent filtration speed and performance were achieved. The customer is satisfied with the performance of Grade 41 Whatman™ filter paper in zinc analysis.
* Filtration speed varies according to the funnel size, sample volume, and experimental conditions
This work demonstrates that Grades 40 and 41 of Whatman™ quantitative filter paper show good separation performance, speed, and repeatability in high molybdenum, lead, and zinc analyses. All of the customer requirements were met for all three tests. Therefore, these papers have the potential to improve the quality control process in mining industries.
Data for high molybdenum, lead, and zinc analysis were kindly provided by Hubei Geological Research Laboratory, Hubei, China.
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