Cooperative measurements were made on standard chromate solutions with thirteen Cary spectrophotometers. Absorbance readings of the instruments were in satisfactory agreement, corresponded well with values from earlier studies, and were proportional to the concentration of standard.
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These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.020.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Table II
Absorbance values of all instruments. Potassium chromate solution B (0.0800g/l in 0.05N KOH).
These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Check points at which readings from two consecutive curves differ by more than 0.020.
Table III
Absorbance values of all instruments. Potassium chromate solution C (0.1200 g/l in 0.05N KOH).
These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Readings of two instruments omitted.
Check points at which readings from two consecutive curves differ by more than 0.020.
Reading of one instrument omitted.
Readings of three instruments omitted.
Table IV
Instrument slit widths, settings, and apparent wavelengths of band maxima.
Inst. ser. No.
Approximate slit width at (mμ)
Slit cont. set.
Dyn. pot. set.
Apparent band λ (mμ)
220
230
250
270
290
310
330
360
400
1
2
11
2.2
0.72
0.28
0.20
0.16
0.14
0.12
0.11
0.10
⋯
4
273.5
371.5
25
2.3
1.10
0.57
0.38
0.30
0.26
0.22
0.19
0.18
⋯
3
273.5
371.5
37
2.2
1.10
0.50
0.30
0.21
0.16
0.12
0.10
0.09
10
4
273
370
52
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
273.5
372
67
0.80
0.25
0.13
0.07
0.06
0.05
0.04
0.03
0.03
5
4
274
372
68
2.0
0.99
0.40
0.26
0.18
0.15
0.12
0.11
0.11
10
4
273
370
81
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
10
3
273.5
370
101
0.10
0.05
0.04
0.03
0.03
0.03
0.03
0.02
0.02
10
3
273.5
370
102
0.63
0.44
0.34
0.28
0.24
0.21
0.20
0.19
0.17
10
5
273.5
371.5
107
0.16
0.09
0.07
0.07
0.06
0.05
0.04
0.04
0.04
10
4
273
370
113
0.49
0.30
0.20
0.16
0.14
0.12
0.11
0.10
0.09
10
4
273.5
370
172
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
10
3
274
370
221
0.55
0.29
0.18
0.15
0.13
0.12
0.11
0.10
0.10
10
3
274
370
Table V
Ratios of absorbance values of solutions. All instruments at chromate absorption maxima.
These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.020.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Table II
Absorbance values of all instruments. Potassium chromate solution B (0.0800g/l in 0.05N KOH).
These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Check points at which readings from two consecutive curves differ by more than 0.020.
Table III
Absorbance values of all instruments. Potassium chromate solution C (0.1200 g/l in 0.05N KOH).
These values from one run only. Others are average of readings from two consecutive curves.
Check points at which readings from two consecutive curves differ by more than 0.010 but less than 0.020.
Readings of two instruments omitted.
Check points at which readings from two consecutive curves differ by more than 0.020.
Reading of one instrument omitted.
Readings of three instruments omitted.
Table IV
Instrument slit widths, settings, and apparent wavelengths of band maxima.
Inst. ser. No.
Approximate slit width at (mμ)
Slit cont. set.
Dyn. pot. set.
Apparent band λ (mμ)
220
230
250
270
290
310
330
360
400
1
2
11
2.2
0.72
0.28
0.20
0.16
0.14
0.12
0.11
0.10
⋯
4
273.5
371.5
25
2.3
1.10
0.57
0.38
0.30
0.26
0.22
0.19
0.18
⋯
3
273.5
371.5
37
2.2
1.10
0.50
0.30
0.21
0.16
0.12
0.10
0.09
10
4
273
370
52
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
273.5
372
67
0.80
0.25
0.13
0.07
0.06
0.05
0.04
0.03
0.03
5
4
274
372
68
2.0
0.99
0.40
0.26
0.18
0.15
0.12
0.11
0.11
10
4
273
370
81
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
10
3
273.5
370
101
0.10
0.05
0.04
0.03
0.03
0.03
0.03
0.02
0.02
10
3
273.5
370
102
0.63
0.44
0.34
0.28
0.24
0.21
0.20
0.19
0.17
10
5
273.5
371.5
107
0.16
0.09
0.07
0.07
0.06
0.05
0.04
0.04
0.04
10
4
273
370
113
0.49
0.30
0.20
0.16
0.14
0.12
0.11
0.10
0.09
10
4
273.5
370
172
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
⋯
10
3
274
370
221
0.55
0.29
0.18
0.15
0.13
0.12
0.11
0.10
0.10
10
3
274
370
Table V
Ratios of absorbance values of solutions. All instruments at chromate absorption maxima.