Skip to main content

What is metal testing called? What is chemical testing for precious metals?

Metal tests reveal the property of various metals and alloys in terms of durability, strength, and failure. It decides whether the metal is suitable for the particular purpose for which it is intended to use. According to one of the best metal testing in Chennai, the metal tests are also known as metallography evaluation, metallographic examination, and metallurgical analysis. While experts use different advanced testing procedures for different metals, this blog is focused on listing a few of the chemical testing methods for precious metals.

Scratch & acid test

This is one of the most common tests carried out by gold testing labs in Chennai to determine the purity of the metal. A scratch stone is used to scratch the piece of metal and then different types of acids are poured. This method determines the karats and helps determine the value of the end product. However, this method is hazardous as the pouring of acids may burn your fingers.

Fire assay

Fire assay is one of the oldest techniques to test precious metals. Gold and Silver Testing Labs in Chennai consider this destructive method the most accurate method to test precious metals. The process involves melting the impure metal in a temperature-resistant cupel and then applying a blast of hot air in a furnace. 



Acid digestion for Silver

Often the best Silver testing Labs in Chennai use this procedure for maximum recovery and precision. This method is beneficial for low-grade silver samples as Silver can suffer from nugget effects, enabling error detection at lower levels.

Gold cyanidation

Cyanide leaches are also used to determine potential cyanide extraction efficiency for Gold and Silver. One significant advantage of this procedure is its lowest detection limits. The test procedure can detect impurities at a level as low as 0.02 ppb. Samples that are expected to have high copper sulfide concentration are tested using this method, followed by fire assay. 

Bulk leach extractable Gold or BLEG

This method uses cyanide leach on the metals. The process is helpful for large sample sizes (500 g or 1 kg) and gives the most accurate results.

Apart from the chemical methods, there are various other testing procedures for precious metals like electrical conductivity tests, XRF analyses, and other non-destructive tests. Contact Tamilnadu Test House, one of the leading Metal testings in Chennai, to test your precious metals accurately.


Ref

https://www.thermofisher.com/blog/metals/5-precious-metals-analysis-methods/

https://labtesting.com/services/materials-testing/metallurgical-testing/#:~:text=Metallurgical%20Testing%20typically%20uses%20microscopy,Metallographic%20Examination%20and%20Metallurgical%20Analysis.

https://www.alsglobal.com/en/geochemistry/precious-metals-analysis


Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

Cosmetics Testing labs in Chennai

Tamilnadu Test House Pvt Ltd is an NABL-accredited laboratory as well as an accredited laboratory. Tamilnadu Test House is a well-known lab in the fields of Chemistry, Microbiology, and Biotechnology. We offer services in LCMS, GCMS, HPLC, GC, FT-IR, AAS, TGA, DSC, UV-Vis, and in all spectroscopies, and chromatography instruments. We are offering the following services in Cosmetic 1.      Test the cosmetic Products as per BIS standards and certify the Products 2.      Chemical analysis of Cosmetic Products 3.      Microbial Analysis and Contamination of the Products 4.      Heavy metal contamination 5.      Organic certification of the Products 6.      Allergen testing as per IFRA Standards 7.      Comparative study of your product with international brands 8.      Shelf life study  9.      Preservative efficacy study Please call us at +91 75500530...
Post a Comment
Read more

What is the laboratory test for soap? What is the test method for soap?

There are several laboratory tests used to evaluate the quality and properties of soap. Some of the common tests include: 1. pH Test Purpose : To determine the acidity or alkalinity of the soap. Method : A small amount of soap is dissolved in distilled water, and the pH is measured using pH paper or a pH meter. The ideal pH for soap is usually between 9 and 10. 2. Total Fatty Matter (TFM) Purpose : To measure the percentage of fatty matter in the soap, which indicates its quality. Method : The soap is dissolved in alcohol, and the fatty matter is extracted using an organic solvent like petroleum ether. The solvent is then evaporated, and the residue is weighed to determine the TFM content. 3. Free Alkali Test Purpose : To measure the amount of free alkali present in the soap, which can cause skin irritation. Method : The soap is dissolved in ethanol, and the solution is titrated with hydrochloric acid using phenolphthalein as an indicator. 4. Moisture Content Purpose : To determine the...
Post a Comment
Read more

Top 10 Food Testing Methods for Safety and Quality Assurance

Food safety and quality assurance are crucial for ensuring that products are free from harmful substances and meet the required standards. Here are the top 10 food testing methods used in the industry: 1. Microbiological Testing Purpose: Detects harmful microorganisms like bacteria (e.g., Salmonella, E. coli), yeasts, molds, and pathogens. Method: Culture methods, PCR (Polymerase Chain Reaction), or immunoassays to identify contamination and ensure food safety. 2. Allergen Testing Purpose: Identifies the presence of food allergens (e.g., peanuts, gluten, soy). Method: ELISA (Enzyme-Linked Immunosorbent Assay), PCR, and mass spectrometry are commonly used. 3. Chemical Contaminants Testing Purpose: Detects chemicals like pesticides, herbicides, and heavy metals. Method: Techniques like Gas Chromatography (GC), Liquid Chromatography (LC), and ICP-MS (Inductively Coupled Plasma Mass Spectrometry) are used to ensure chemical safety levels. 4. Nutritional Analysis Purpose: Verifies ...
Post a Comment
Read more