Low concentrations of thallium near the detection limit gave the dimensionless instrument readings: 210.5 210.5, 177.5 177.5, 167.5 167.5, 179.5 179.5, 224.5 224.5, 165.3 165.3, 228.3 228.3, 206.9 206.9, 139.9 139.9, and 210.7 210.7. Ten blanks had a mean reading of 58.3 58.3. The slope of the calibration curve is 1.89 × 10 9 M − 1 1.89×109 M−1. Estimate the signal and concentration detection limits and the lower limit of quantitation for thallium.