How to Choose pH Calibration Buffers: pH 4.01, 7.00, and 10.01
A practical guide to calibration range, temperature, traceability, and routine quality control
Direct AnswerChoose pH calibration buffers that bracket the expected sample pH and follow the meter and electrode manufacturer's calibration procedure.
Choosing Anhydrous Solvents for Moisture-Sensitive Workflows
A practical purchasing guide to water limits, packaging, handling, and fit for purpose
Direct AnswerChoose an anhydrous solvent by matching the solvent identity and water specification to the actual sensitivity of the method or reaction.
What Is Anhydrous-Grade Solvent? Understanding Water Limits in ppm
A practical introduction to low-moisture solvents, ppm water specifications, and the handling controls needed after opening
Direct AnswerAn anhydrous-grade solvent is manufactured and specified to contain a low amount of water.
Formic Acid in LC-MS Mobile Phases: What It Does and What to Verify
How a common volatile modifier affects pH, chromatography, ionization, background, and routine mobile-phase control
Direct AnswerFormic acid is commonly added to LC-MS mobile phases as a volatile acidic modifier.
Volatile vs Nonvolatile Mobile-Phase Additives in LC-MS
Why additive volatility matters at the mass-spectrometer interface—and how to choose an additive without sacrificing chromatography or signal quality
Direct AnswerFor routine LC-MS, analysts generally prefer volatile mobile-phase additives because they can leave the electrospray or atmospheric-pressure ionization interface with the solvent.
What Is LVI-GC Grade and When Is It Needed for Trace Organic Analysis? Direct Answer
LVI-GC is an RCI Labscan application designation for solvents used in large-volume injection gas chromatography and related trace-organic work. It is not a universal regulated grade or a guarantee that a solvent will suit every method.
What Is Headspace GC and Why Does Diluent Quality Matter? Direct Answer
Headspace gas chromatography (HS-GC) analyzes volatile compounds that partition from a liquid or solid sample into the gas phase above it. Diluent quality matters because the diluent can contribute its own peaks, change analyte partitioning, or introduce contamination that interferes with residual-solvent results.
How Solvent Purity Affects GC Baselines, Blank Runs, and Detection Limits Direct Answer
Solvent purity affects GC performance when impurities create peaks, increase baseline noise, or leave residue in the inlet and column. These effects can make blank runs look contaminated, reduce signal-to-noise ratio, and make a low-level analyte harder to detect.
RCI Product Knowledge Update: Solvents, Grades, and Documentation
Distributors and business partners often need to translate a customer's laboratory request into three connected questions: which chemical the method requires, which grade fits the application, and which documents are needed for the exact product and supplied lot.
How to Store Laboratory Solvents Safely and Preserve Quality Direct Answer
Store laboratory solvents according to the current Safety Data Sheet (SDS), container label, manufacturer instructions, applicable local rules, and your laboratory’s chemical-hygiene procedure.
