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. Author manuscript; available in PMC: 2007 Oct 24.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2007 May 10;855(2):159–165. doi: 10.1016/j.jchromb.2007.04.039

Table 2.

Interday analysis of 1-hydroxypyrene in spiked artificial urine.

Addition of
50 pg/ml 200 pg/ml 800 pg/ml
Day 1 (n=4) Mean 50.1 204.2 806
RSD% 4.5 2.2 1.6
RE% 0.2 2.1 0.8
Day 2 (n=4) Mean 47.4 202 791
RSD% 6.6 1.6 2.8
RE% -5.1 1.0 -1.1
Day 3 (n=4) Mean 48.7 208.2 802.8
RSD% 8.2 4.3 0.7
RE% -2.6 4.1 0.3
Total interday (n=12) Mean 48.7 204.8 800.1
RSD% 6.4 3.0 1.9
RE% -2.6 2.4 0.01