Discussion
When is a splitless injection used instead?
Answer: A
Sending the whole sample onto the column suits trace work, where discarding ninety-nine per cent of it would put the analytes below detection. A concentrated sample would overload the column, packed columns take direct injection, and thermal lability calls for on-column injection. Which injection mode to use is decided by concentration first and by thermal stability second, and the two questions are quite separate. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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