| 摘要 |
PCT No. PCT/AU93/00356 Sec. 371 Date Jan. 10, 1995 Sec. 102(e) Date Jan. 10, 1995 PCT Filed Jul. 16, 1993 PCT Pub. No. WO94/02945 PCT Pub. Date Feb. 3, 1994A method and apparatus for recalibrating analytical instruments such as atomic absorption and inductively coupled plasma spectrophotometers comprises the use of coupled piston pumps and valves in a fluid conduit system to obtain a sample value (h) during one half of a pump cycle and standard gradients (S1-S6) during the other half cycle. The piston pumps are actuated by cams of selected profiles to obtain a predetermined flow rate from each pump, the flow from each pump being selectively combined to construct standard gradients from two or more standard solutions and to effect autoranging of the standards in response to a previously determined sample value.
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