Table 1.
Results of least squares fitting of Eq. (3) to LO data for two stock solutions of different microsphere types, on two different LO instruments of the same type. Stated uncertainties are type A standard uncertainty of the mean.
| Microsphere lota | S | S | URB | URB |
| Instrument | A | A | A | B |
| Run date | 28 AUG 2014 | 12 MAY 2016 | 16 NOV 2016 | 17 NOV 2016 |
| Lower number concentration limit, mL−1 | 2,000 | 10,000 | 5,000 | 5,000 |
| Upper number concentration limit, mL−1 | 10,000 | 46,000 | 36,000 | 36,000 |
| αc, mL | (1.79 ± 0.38)×10−6 | (1.76 ± 0.49)×10−6 | (1.81 ± 0.07)×10−6 | (1.18 ± 0.08)×10−6 |
| αt | −0.0016 ± 0.0010 | −0.0026 ± 0.0007 | −0.0013 ± 0.0006 | −0.00161 ± 0.0007 |
| N, mL−1 | 95,377 ± 382 | 100,583 ± 230 | 96,545 ± 252 | 95,892 ± 281 |
| Reduced chi-square, χv2 | 1.12 | 0.52 | 1.14 | 1.45 |
| DF | 78 | 27 | 45 | 45 |
a
S = sulfate functionalized PSL microspheres, URB = fluorescently dyed “ultrarainbow microspheres.”