How To Calculate The Mass Of Meoh 1 (21.93 KiB) Viewed 57 times
5. Repeatability Analyse 6 independent replicates of the sample. Please fill the table below: Mass of Dilution MeOH Conc. Mass of MeOH in sample (g) factor (mg/L) the sample (g) 1.0618 553.45574 1.0558 577.5075 1.07224 581.6832 1.05874 607.82034 1.05424 596.36574 1.0471 570.00614 Mean ← S.D ← A R.S.D (%) (Hint: The unit of mass of sample (g) should be changed into mg/L) [Please refer to additional information] 1.04 1.04 1.0 1.04 1.04 1.04 The percentage of MeOH in the sample (%)< HE #6 E
Additional information:< 1. Standard preparation 1.1 Standard solution 5000mg/L (standard stock) Dissolve 0.25g menthol in Methanol-chloroform (1:1) and make up to 50mL 1.2 Stock internal standard, 2000mg/L (IS Stock) Dissolve 0.1g Naphthalene in Menthol-Chloroform (1:1) and make up to 50mL 1.3 Calibration standards< Prepare the working standards as follows Working Conc. of menthol Vol. of standard Vol. of internal standard standard (mg/L) stock (ml) standard stock 14 100 0.24 14 24 200 0.4 14 34 500 4 1000 5 2000 14 24 4 14 14 14 Make up volume (mL) 10 10 10 10 10 ← ←
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