Gravimetric microanalysis of beryllium silicate rocks

The Application of Statistics to Quantitative Analysis

“…As the expected result, 10.77 per cent, lies within this range, the presence of a constant error cannot be justly assumed. The calibration was actually repeated in a different location, with different apparatus and reagents by another worker (5), and the arithmetical mean of a series of fourteen determinations was 10.78 ± 0.006 per cent Al2Os (±0.6 Voo).…”

“…If changes of barometric pressure are likely to occur between consecutive weighings, the variations of the buoyant effect must be considered. 5. Special care must be devoted to the perfect functioning of the arresting mechanism and to its proper use.…”

“…Accidental errors p = * Va2 + ß2 + 2 (4) p'-* Va'2 + ß'2 + y'2 (5) The formulas are easy to memorize, considering the identical mathematical form of the equations of the same horizontal row and the fact that the left column uses the absolute errors while the right column employs the relative errors.…”