Alex Stewart Romania provides complete independent analytical services for base metals, ores and concentrates. Testing combines classical wet chemistry techniques with high-precision, state-of-the-art instruments, including atomic absorption, ICP and carbon-sulphur.
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Non-ferrous metals
Base metals, ferrous ores and concentrates
Precise independent analysis
Our analytical services can be combined with representative inspection and sampling carried out through the Alex Stewart office network across Africa, America, Asia, Australia and Europe.
Strategically located inspection operations cover major ports and refineries for base and non-ferrous metals. Services include full inspections, draft surveys, transportable moisture limits, weighing supervision, stock control and sampling.
Complete sampling and analysis
Copper
Lead
Tin
Zinc
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Specialist materials
Ferro-alloys, rare metals and lanthanides
Precise independent analysis
Through the Alex Stewart International operational network, we provide complete independent analysis for ferro-alloys, rare metals and lanthanides (rare earths). These analyses can be combined with representative inspection and sampling services.
We offer comprehensive inspection, weighing, sampling, particle-size determination, sample preparation and analytical services for rare metals, ferro-alloys, noble metals and bulk commodities.
Sampling and analysis
Antimony and bismuth
Cadmium and chromium
Cobalt and indium
Magnesium and manganese
Molybdenum, nickel and niobium
Rhenium, tantalum and titanium
Tungsten, selenium, silicon and vanadium
Certifications for rare metals include antimony and bismuth, manganese, selenium and cadmium, tantalum and niobium, cobalt, indium and titanium.
Alex Stewart International can design, install and staff laboratories for major exploration projects almost anywhere in the world.
Standards
Laboratories are accredited to ISO 9001, ISO 14001 and ISO 17025 and participate in inter-laboratory testing.
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Precision and traceability
Precious metals and jewellery
Inspection, sampling and analysis services
Alex Stewart Romania provides inspection, sampling and analysis at major metal plants, working with the Alex Stewart International office network across Africa, America, Asia, Australia and the Far East.
Inspection services include weighing, representative sampling and melting supervision at plants or warehouses. Analytical services use classical chemistry, gravimetric titration, fire assay, atomic absorption and ICP.
Precious metals include
Gold or silver bars
Catalysts and concentrates
Electronic waste
Jewellery
Jewellery and gold testing
Alex Stewart International can weigh, test and analyse jewellery containing gold or other precious metals, including earrings, bracelets, necklaces, rings, fillings, chains, watches, pendants, coins and souvenirs.
X-ray testing is non-destructive and requires minimal sample preparation. A complete report indicates the percentage of gold and alloying metals, and an official certificate is sent by email with the sample returned.
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Quantity and quality
Metallurgical products, waste and recycled metals
Professional inspection services
Inspection services in the metallurgical industry include the safe supervision of loading and discharge for steel coils and finished and semi-finished metallurgical products. Quantity and quality are determined through weighing, sampling, testing, measurement and visual observation.
Depending on contractual terms, supervision includes weight determination by weighing or draft survey, vessel-hold inspection, visual inspection, counting and classification.
Scrap metal
Non-radioactivity certification, quantity determination by draft survey for ships and barges, quality assessment according to ISRI and international requirements, density assessment and evaluation of out-of-specification material.
Metallurgical products
Quality pre-inspections, counting, loading and discharge supervision, certified industrial testing approval, and physical and chemical tests.
Recycled waste and cast iron
Quantity and quality certification for ferrous, non-ferrous, electronic or plastic waste, including supervision, quantity determination, damaged-ingot assessment and chemical analysis.
Services for scrap, waste and recycled metals are performed through the Alex Stewart International office network. Digital photographic evidence is provided for pre-inspections and arrival inspections, while radioactivity testing and hazardous-material checks help protect clients from unnecessary financial or environmental claims.
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Energy and bulk commodities
Solid fuels: coal and coke
Alex Stewart Romania offers complete coal and coke inspection and analytical services on a global scale. Quantitative and qualitative inspection, certification, loading and discharge supervision, sampling, particle-size analysis, stock inspection, moisture determination and sample preparation are performed according to international standards.
Analytical services
Moisture
Ash
Volatile matter
Calorific value
Fixed carbon
Sulphur
Phosphorus
Silicon
Iron
Aluminium
Chlorine
Fluorine
Calcium oxide
Manganese oxide
Titanium oxide
Adapted procedures
Analytical procedures are determined in triplicate and adapted to client requirements. They include fusion ash, minerals, sulphur, ultimate analysis, chlorine and fluorine, as well as Hardgrove Grindability, Roga and Free Swelling Indices.
