Does the concentration refer to the amount of chlorophyll in the leaves while the content refers to the amount of chlorophyll per unit area?
Yes it is a good paper - on first thought - concentration is relative - content is total - but the paper cited goes beyond.
No, it is the other way I think. Chlorophyll concentration refers to the given leaf area. for instance in a chlorotic leaf or under etiolation, the chlorophyll concentration should differ in one and the same leaf from one area to the other.
The chlorophyll content generally refers to the weight of the leaf ( Microgram of chlorophyll per gram of leaf).
Well that is what i meant Prof Vivekanandan by saying chl conc. is realtive - what you have well explained as different for different areas of leaf - so it will be relative to the leaf area studied - whereas in content we mean total - which you have explained as content viv a vis wt. of leaf - it is a nice elaboration of what I meant but definately more clear - Thanks
A concentration is an amount of any type per volume of liquid or gas system, whereas content is an amount of any type per mass of liquid or gas or solid system. However the concepts ‘concentration’ and ‘content’ alone are still ambiguous because, depending on the type of amount of the component (analyte) per volume or mass of a system, there are different types of concentrations and contents
In basic chemistry terms, and as normally applied in medical sciences, the term concentration refers to a substance's amount, of whatever type expressed as amount per mass basis.
On the other hand, content is regarded as amount of a substance expressed per volume. The above distinctions have been clarified in this article below
https://hrcak.srce.hr/index.php?id_clanak_jezik=152607&show=clanak
However, there is a distinct usage of these terminologies across disciplines.
In plant sciences, concentration is equally used when referring to data expressed per mass basis. On the other hand, content is used when expressing data as amount per plant/ organ.
For example, lets say you use 10g FW of leaf sample out of 100g total plant sample.
You analyse chlorophyll and get 10 nmol/ 10 g FW. Here, chlorophyll concentration is 1 nmol/ g FW. When expressed as content, it is 100 nmol/ plant or per leaf organ(10/10*100).
However, usage of these terminologies remain contradictory and non-universal in the literature, within and across disciplines.
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