The unique selling point of ASTM D4546 is Speciation . While other methods give a total "bulk" sulfur number, D4546 can distinguish between different types of sulfur (e.g., thiophenes, sulfides, mercaptans). This is vital for refinery engineers who need to know which sulfur compounds are present to optimize the hydrotreating process.
It’s likely you meant (the 2021 version of the soil swell/collapse test). astm d454621 pdf
The ASTM D4546-21 PDF provides comprehensive guidelines for professionals in geotechnical engineering, soil science, and related fields, ensuring consistency and accuracy in assessing soil-water interactions. For detailed information, downloading or purchasing the PDF directly from ASTM's official website or an authorized document provider is recommended. Understanding ASTM D4546-21: The Standard Test Methods for