Analytical Testing Suntech Analytical Services Division (ASD) offers the following services: 1. Sample Preparation Section equipped with drying ovens, primary and secondary crushers, riffle splitters, screens as well as pulverizers. Material going for chemical analysis, acceptable particle size must be at least 80% passing through 75 microns. 2. Fire Assay Technique This technique is used to assay for gold as well as PGMs. Pulverised sample is weighed and mixed with lead-containing assay flux and a collector is added to aid the lead in the collection of the precious metals. Mixture is heated in a furnace (fusion) and the fusion fluid can stand in an iron mold resulting in the formation of a lead button at the bottom of the mold. Lead button is taken through cupellation furnace where the lead melts and is absorbed into a porous cupel leaving behind a tiny “prill containing only the precious metal and the collector. The prill is then taken for either gravimetric determination or instrumental analysis. 3. Gravimetric Analysis This method involves treating a prill to separate the collector from the precious metal and then comparing the precious metal weight to the initial sample weight to determine the concentration. 4. Acid digestion Sample pulp is oxidized in concentrated acid or acid mixture on a hot plate and brought into solution for instrumental analysis. 5. Peroxide Fusion Mixture of pulverized sample and sodium peroxide is fused in a furnace; the melt is dissolved in acid and the resultant solution is sent for titrimetric or instrumental analysis. 6. Titrimetric Analysis The method is based on the reaction between a sample solution and a solution with a known concentration. Volume measurements are taken to determine the end-point of the reaction and calculations done to determine the concentration. 7. Instrumental Analysis Analytical Service Division is equipped with ICP-OES instrument as well as XRF instrument ICP Analysis – this technique analyzes solution samples and can be used for a wide range of elements. A solution sample is aspirated and atomized in very hot inductively-coupled plasma flame. The excited atoms will emit radiation with wavelength that is characteristic of the elements present. XRF Analysis – the pulverized sample is mixed with binder wax and pressed into a pellet with a smooth surface. An x-ray source generates high energy x-rays that bombard the sample causing ionization of atoms. The resultant movement of electrons to maintain a stable atomic structure causes the sample to emit radiation that is characteristic of the elements present.