Overview of Metals Preparation Methods
Galbraith Laboratories employs a range of instrumental methods to digest and then measure Group I Metals, Group II Metals, Transition Metals, Metalloids (such as boron, silicon, germanium, etc.) and some Non-Metal elements (such as sulfur and iodine) in a wide variety of sample matrices. Each successful analysis begins with sufficiently preparing (digesting) the sample for the analysis. The final outcome of each preparation is to afford a homogenous solution of the analyte in the analysis solvent. In most cases, the analysis solvent is water, though organic solvents may occasionally be used. The following is a representative list of preparation methods available for general analytical use:
G-30B Wet Ash Digestion of Inorganic and Organic Compounds
This method is a hot concentrated acid digestion of organic substances for ICP-AES, ICP-MS, FAA and GFAA analysis. Since the digestion is conducted in an open vessel, it is not suitable for volatile metals, such as mercury.
G-35A Sample Preparation – Water Dilution
This method is a water dissolution of water-soluble compounds. In many cases, the solution is stabilized by the addition of acid.
G-35D Solvent Dissolution
This method is a solvent dissolution of water-insoluble compounds. This method is commonly used in FAA analyses, especially for silicone analysis.
G-45D Dry Ash Prep for Trace Boron by ICP-AES
This method is a furnace ashing procuedure, specifically for the analysis of trace boron.
G-45E Dry Ash of Organic Compounds
This method is a furnace ashing procedure. It is applicable to organic samples for a wide range of metals analysis.
G-52 Microwave Assisted Acid Digestion of Samples for Metals Analysis
This method is a closed-vessel digestion procedure that relies on a microwave source to heat the preparation. It is widely used by Galbraith for the digestion of organic substances for analysis of volatile metals.
The following methods are fusions largely meant for recalcitrant substances that do not digest using other means. These methods are often used for compounds such as Aluminum Oxide, Titanium Dioxide, Silicon Dioxide, Barium Sulfate, ceramics, etc.