||Chem Excellence: Foundations for Excellence in the Chemical Process Industries
14.6 Analyze Plant Materials
Tasks conducted by PTOs related to this critical job function include:
- Follow specified procedures to collect appropriate samples for analysis from process streams or products (solids/liquids/gases).
- Visually inspect samples to ensure adequate representation of the sampled materials, and determine if any immediate response is required.
- Label samples appropriately and according to any prescribed procedures.
- Deliver samples in a condition representative of the material to testing locations.
- Prepare necessary reagents and standards required to conduct tests.
- Calibrate instruments as required.
- Analyze quality control standards to appropriate precision levels by using prescribed methods.
- Perform appropriate physical and chemical tests, according to standard procedures.
- Calculate results using calculators and computers.
- Determine if resampling and reanalyzing are necessary.
- Maintain analysis area to ensure correct results will be produced repeatedly.
- Report results using prescribed procedures or effective presentation techniques to appropriate personnel.
- Adjust process parameters as necessary following standard practice, or as appropriate to respond to analytical results.
- Enter data into computers and other appropriate logs.
- Review trends of process variations and sample analyses.
- Compare sample analyses with control values and respond appropriately.
- Prepare proper paperwork to submit samples to the laboratory.
Technical Performance-based Skill Standards
For this critical job function, entry-level PTOs are expected to:
- Characterize gases, liquids, and solids.
- Describe procedures for obtaining representative samples of solids, and demonstrate use of appropriate techniques.
- Describe sampling devices for use with gases under pressure, and demonstrate how to use typical sampling devices.
- Sample a flowing liquid stream.
- Describe proper techniques for handling materials, including industrial hygiene, safety, and environmental considerations.
- Choose proper containers for a variety of solids, liquids, and gases, each with a wide range of physical properties.
- Write common and standard chemical names and use symbols appropriate for the local industries.
- Demonstrate standard labeling procedures.
- Measure pH using a variety of common techniques, and demonstrate proper care and maintenance for each technique.
- Locate proper procedures and implement standard measurement and analytical procedures (such as ASTM, AOAC, etc.).
- Calculate normality, molality, and molarity; prepare standard solutions.
- Describe at least 20 physical properties of materials including specific gravity, density, flash point, and viscosity; describe measurement methods for each.
- Select appropriate devices or techniques and measure at least 15 different physical properties.
- Conduct chemical analyses using volumetric techniques, such as acid- base titrations, redox titrations, etc.
- Use instrumental methods such as gas chromatography, infrared, basic spectrophotometry, and colorimetry, and describe the theory applicable to each.
- describe pressure and temperature relationships for all states of matter.
- Balance simple chemical equations.
- Perform calculations involving stoichiometry, solutions, and physical properties.
- Set up, use, and maintain automated equipment for conducting tests.