Alex Stewart International's laboratories have a unique competence: a trustworthy and recognised global network that employs qualified and experienced chemists using state-of-the-art analytical equipment to deliver the most precise and prompt results service for a wide range of industry sectors.

The strategically located Alex Stewart laboratory network proves the full range of assaying and analytical services for base, minor and precious metals, including jewellery, ores and concentrates, ferro alloys, recycled scrap metal, metallurgically complex materials, coal, geochemical mining and exploration services. Through Alex Stewart Agriculture, we are also able to provide a complete range of analytical services for agricultural soft commodities and products.

All Alex Stewart laboratories tailor their services to deliver cost effective and fast turnaround analytical services without compromising quality and result accuracy. Metal laboratories are able to perform analyses for over 70 elements of the Periodic Table.

Analytical Instruments Include:

  • ICP Emission Spectrometers: Analysis of a wide range of elements at PPM for multi-elemental accurate results
  • AA - Atomic Absorption Spectroscopy: Measures low levels of elements in all metallurgical materials
  • Carbon Sulphur Determinator
  • X-Ray Fluorescence Spectrometer: Determine principal and trace elements
  • High Precision Titrators: Fast and accurate determination of elements including silver, chlorine, fluorine and ferro alloys
  • GC-MS
  • HPLC

Services Include:

  • Confirm the date sample(s) were received
  • Advise the date you can expect your final results and certificates
  • Deliver fast turnaround and accurate results
  • Give a status report and provisional result updates
  • Release e-certificates and hard copy reports
  • Arrange additional tests as and when required
  • Offer technical advice and result interpretation
  • Provide professional and friendly customer service
  • Carry out all clients' work in complete confidentiality


Rapid XRF-screen Testing

Alex Stewart International can carry out rapid XRF screen testing of electronic components and PCBs in accordance to the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) Directives. To comply with RoHS and WEEE you must ensure that your products are thoroughly checked. Our screening tests will verify the percentage of harmful elements in line with the RoHS Directive.

Whether your company manufactures products, supplies to the end manufacturer or recycles electronic scrap by testing electronic components, household appliances, telecommunications equipment, toys and other consumer goods, you will receive a certificate that confirms whether or not your product contains lead, mercury, cadmium, hexavalent chromium or polybrominated biphenyls.

Further in-depth analyses can be applied on request if evidence that these materials are present is found.

XRF Detection Limits

  • Cadmium 100ppm
  • Chromium, Lead, Mercury, Bromine 1000ppm


By choosing our screen testing services, you will:

  • Control your liability
  • Limit long-term expenses and time involvement
  • Limit supply chain disruptions and avoid loss of revenue to competitors
  • Improve your production turnaround time

Agricultural and Environmental Services

Analytical, Inspection and Certification Services

Alex Stewart Agriculture, a member of the Alex Stewart International network of laboratories, is a UKAS accredited company that works to ISO/IEC 17025: 2005 standards and provides world-class FOSFA, GAFTA and UKAS approved independent inspection and agriculture laboratory services. Supported by the A. Norman Tate and Huson and Hardwick Laboratories, we offer a complete range of agricultural analytical, inspection and certification services for the facilitation of the international trading of soft commodities including animal feed, oilseeds, oils & fats, bio diesel, grains and cereals, fertilisers, raw & refined sugar and other food products.

International Trade Accreditations

Globally recognised standards organizations recognize the excellence of the multi-faceted Alex Stewart Agriculture service. These include:

  • Grain and Feed Trade Association (GAFTA)
  • Federation of Oil Seeds and Fats Association (FOSFA)
  • UK NIR Grain Network
  • Department of Environment, Food and Rural Affairs (DEFRA)
  • The Sugar Association of London (SAL)
  • Malaysian Palm Oil Board (MPOB)
  • Servicio Nacional de Sanidad y Calidad Agroalimentaria (SENASA - ARGENTINA)
  • Associacao Nacional Dos Exportadores De Cereais (ANEC -BRASIL)
  • United Kingdom Accreditation Services (UKAS)

Laboratory Services

  • Argentina
  • Brazil
  • Chile
  • China
  • India
  • Norway
  • Peru
  • Ukraine
  • United Kingdom
  • USA

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