June 18, 2021, 11:17:03 PM
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Topic: express an analytical data  (Read 129 times)

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Offline xshadow

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express an analytical data
« on: June 03, 2021, 06:17:49 AM »
After the Cl- determination in a bottle of water using IC and a calibration method I get:

X= 3,1786  mg/l
S calc. ("standard deviation") = 0,224780537 mg/l

Now I have to express the analitical data:
X ±  t * S calc
3,1786 mg/l ±  0,484960449 mg/l


Have to approximate the uncertainty ""±  0,484960449 mg/l""  at the first non-zero term ??
Reading the J.R. Harrys usually the uncertainty is approximated at the first non zero term....

In this case I get:
0,5 mg/l....

THANKS :)

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