What does chromatogram mean?
A chromatogram is the visible output of chromatography, a laboratory technique for separating the components of a mixture. As each component travels through the system at a different rate, the instrument records their arrival, producing a graph of peaks or a pattern of coloured bands. Analysts read this record to identify substances and measure how much of each one is present. The word appears chiefly in scientific and technical writing — in chemistry labs, pharmaceutical quality control, forensics, and environmental testing. It pairs naturally with terms such as gas chromatography and liquid chromatography, and its plural peaks are read like a diagnostic fingerprint of the sample. Although unfamiliar outside specialist circles, it derives from familiar Greek roots: khroma, meaning colour, and gramma, meaning something written. Understanding it offers a window into how modern science turns invisible mixtures into readable evidence.
nounA chromatogram is the visual record produced by chromatography — typically a graph or chart showing the separation of the components of a mixture as a series of bands or peaks.
- The graphic or photographic record produced by chromatography, showing separated components as peaks, bands, or spots.
"The lab technician studied the gas chromatogram to identify the compounds present in the sample."
"Each peak on the chromatogram corresponds to a distinct compound in the mixture."
"She compared today's high-performance liquid chromatogram with last week's to confirm the purity of the batch."
Regular plural; standard in laboratory reports when referring to multiple records.
"All three chromatograms showed consistent retention times across the runs."
Every chromatogram is essentially a fingerprint of a mixture — forensic scientists once relied on them to prove which brand of gasoline was at an arson scene.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chromatogram
The term was coined in the early twentieth century by the Russian botanist Mikhail Tsvet, who invented chromatography around 1900–1906 while separating plant pigments. It combines the Greek khroma (colour) with gramma (something written or drawn) — fittingly, since Tsvet's original separations were literally visible bands of pigment on paper. The same Greek root khroma gives us words such as chromatic, chromosome, and monochrome, while the -gram element appears in telegram, diagram, and program.
How chromatogram is actually used
A technical term used almost exclusively in laboratory and analytical chemistry contexts; it is formal register and rarely encountered in everyday speech.
Easily confused with chromatogram
Chromatography is the separation technique itself, whereas a chromatogram is the resulting record or graph produced by that technique.
A chromatograph is the instrument used to perform chromatography and generate a chromatogram, not the record itself.