Table 3.

Stability data for thallium.

Storage condition	RSD, %a	Mean Percentage (%) of Day 0
Extract stabilityb
Ambient extracts (5 days)	≤ 2.6	98.0 – 101
Refrigerated extracts (15 days, 4°C)	≤ 0.7	97.2 – 101
Primary Matrix stability b
Frozen samples (5 days, −20 °C)	≤ 0.9	96.4 – 101
Freeze–thaw (3 cycles over 3 days)	≤ 1.6	98.4–100
Secondary Matrix Stability c
(Up to 521 days, −80 °C)
HSDd Rat Maternal Plasma (PND4)	≤ 2.8	101 – 106
HSD Rat Pup Plasma (PND4)	≤ 2.3	103 – 107
HSD Female Rat Urine	≤ 2.4	106 – 112
HSD Rat Fetus	≤ 1.9	93.4 – 110
HSD Rat Brain	≤ 7.3	99.2 – 107
B6C3F1 Female Mouse Plasma	≤ 6.6	99.1–109

^aRSD = percent relative standard deviation

^bPercent of Day 0 were determined for triplicate fortified QC samples at three levels, 2.00, 50.0, and 400 ng Tl/mL plasma.

^cPercent of Day 0 were determined for triplicate fortified QC samples at two levels, 2.00 and 250 ng Tl/mL matrix or ng Tl/g tissue for brain and fetus.

^dHSD = Harlan Sprague Dawley.