Engineer Chemical Analysis case studies
Engineer Chemical Analysis · Put your knowledge to work in context.
The Engineer Chemical Analysis credential is a professional-level examination for chemists and laboratory engineers who plan, run, and defend analytical measurements in industrial, environmental, pharmaceutical, food, or materials laboratories. It tests breadth as well as depth: you are expected to move from a quality-assurance framework through sampling and traceability, classical wet chemistry, molecular and atomic spectroscopy, chromatography and hyphenated techniques, electroanalytical and thermal methods, method validation and measurement uncertainty, and finally laboratory safety, instrumentation, and data integrity. The Engineer Chemical Analysis case studies are 5 cases and about 3,307 words.
1Copper Concentrate Shipment: A Sampling Dispute
A port laboratory is asked to referee a 480 t shipment of copper concentrate split across 24 containers, each about 20 t. The seller's certificate states 25.6% Cu and 8.1% moisture.
665 words, about 3 min2EDTA Titration of Limestone: A Persistent High Bias
A QC laboratory determines CaCO3 in limestone by EDTA titration. A certified reference limestone is 95.1% CaCO3.
642 words, about 3 min3A Dye in Effluent: When Dilution Changes the Answer
An environmental laboratory measures a colored dye in treated effluent by UV-Vis at 520 nm in a 1 cm cell. The calibration is 0.5–10.0 mg/L in deionized water, slope 0.102 AU per mg/L, intercept 0.003, r² = 0.9999.
704 words, about 4 min4Arsenic in Rice Flour: A 172% CRM Recovery
An ICP-MS laboratory determines arsenic in rice flour. A 0.500 g portion is microwave-digested in 5 mL concentrated HNO3 and 2 mL H2O2 and diluted to 50.0 mL.
634 words, about 3 min5Assay Run with a Deleted Injection
A contract HPLC laboratory assays a 10 mg tablet for a small-molecule drug. The method uses a 150 × 4.6 mm, 3.5 µm C18 column, 1.0 mL/min, 30 °C, 254 nm, 10 µL injection, and a phosphate buffer pH 3.0/acetonitrile mobile phase.
662 words, about 3 min