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Table 1 Quantitative parameters for methods A-C.

From: Spectrophotometric determination of etodolac in pure form and pharmaceutical formulations

Parameter

A

B

C

λmax, nm

510

521

726

Beer's conc. Range (μg mL-1)

0.5–8.0

1.0–10

2.0–18

Ringbom conc. Range (μg mL-1)

0.85–7.5

2.0–8.5

3.0–16.5

Detection limits (μg mL-1)

0.065

0.104

0.228

Quantification limit (μg mL-1)

0.217

0.347

0.76

Molar absorpitivity × 10 4(L mol-1 cm-1)

1.812

1.876

1.039

Sandell sensitivity (ng cm-2)

15.86

15.32

27.66

Regression equation a

   

S y/x

0.202

0.285

0.246

Intercept

0.0078

- 0.0018

0.0011

S a

0.142

0.201

0.2007

± tSa

0.365

0.517

0.516

Slope

0.0582

0.066

0.036

S b

0.0285

0.0365

0.018

± tSb

0.0733

0.094

0.0462

Correlation coefficient (r)

0.9999

0.9999

0.9997

Mean ± SD%

99.87 ± 0.659

100.21 ± 0.727

99.875 ± 0.759

RSD%

0.66

0.73

0.76

Variance

0.434

0.528

0.576

SE

0.269

0.297

0.31

Student, s t-valueb (2.571)

1.16

0.323

1.07

Variance ratio F-test b (6.256)

1.06

1.29

1.406

  1. a A = a + b c, where c is the concentration in μg mL-1.
  2. b The theoretical t- and F-values, 2.571 and 6.256, respectively for five degree of freedom at 95% confidence level.