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Elemental & metal standard is a branch of reference materials, which has the characteristics of accuracy, uniformity and stability. Elemental & metal standard can be a pure substance containing a single element or a mixture of many metal elements. Elemental & metal standards are widely used in various testing techniques and play the following roles.
First, they can be used to verify that the instrument is at a normal level. In general, the analysis of an elemental & metal standard with a test instrument is performed, and if the results are within the known range, the instrument is proved to be serviceable. Second, they can be used to calibrate instruments to ensure their accuracy. Last, they can be used to make standard curves, which is essential in quantitative detection. Therefore, more and more attention has been paid to the quality and stability of elemental & metal standards in the field of analysis and testing. Common elemental & metal standards include calcium standard, cobalt standard, sulfur standard, boron standard, gold standard and others.
Inductive coupled plasma emission spectrometer (ICP): Inductive coupled plasma emission spectrometer (ICP) is an important optical analysis method to study the structure of substances and determine their chemical composition according to the characteristic emission spectra of atoms, which has the advantages of wide sample range, various analysis elements, low detection limit, high accuracy, good selectivity and fast analysis speed. For quantitative analysis of ICP, elemental & metal standards are required. For example, boric acid and borax in food can affect the digestive enzyme action to hinder nutrient absorption, and even cause poisoning. Through ICP analysis, the standard solution of element boron can be used to detect borax and boric acid in food, so as to improve the safety of food. In addition, based on standard curve made by the elemental & metal standards, ICP can also be used to quantitatively test the trace heavy metals in food, the content of phosphorus in DNA molecules and others.
Atomic absorption spectroscopy (AAS): Atomic absorption spectroscopy (AAS) is an instrumental analysis method to qualitative and quantitative analysis of the measured elements, which has the advantages of strong selectivity, high sensitivity and wide analysis range. The quantitative analysis of AAS method can be achieved by standard curve method, direct comparison method and standard addition method. Almost all of these methods use elemental & metal standards. For example, in the standard addition method procedure, a certain number of elemental & metal standards that do not exist in the sample are added to the standard solution and the sample solution respectively. Then the absorbance ratio of standard solution and sample solution is determined simultaneously. And then make the standard curve. Finally, the content of detected elements is obtained according to the standard curve. In addition, quantitative analysis of methyl mercury in environmental samples and alkyl lead in gasoline can be achieved by this method.
Ion chromatography: Ion chromatography is a liquid chromatography method for the analysis of anions and cations. Elemental & metal standards have been widely used in the analysis of ion chromatography, especially in quantitative analysis. Generally, the concentration of detected ions is directly proportional to the peak area or peak height, so peak area or peak height is usually taken as the quantitative basis and quantified through the standard curve. Moreover, elemental & metal standards are used to make standard curves. Taking advantages of elemental & metal standards, ion chromatography is widely used in the detection of bioamines, organic acids and sugar analysis.
Alfa Chemistry is one of the largest providers of elemental & metal standards in the world and the quality assurance is of prime importance to Alfa Chemistry. The solvent from Alfa Chemistry in the world is synonymous with reliability and excellent quality. Because of the exacting nature of our business and the regulatory demands placed upon our industry, Alfa Chemistry continues to be at the forefront in terms of compliance, accreditations and certifications.