Test method and calculation method for precision of AA-1800 atomic absorption spectrophotometer - Master's thesis - Dissertation

Test method and calculation method for precision of AA-1800 atomic absorption spectrophotometer

Key words: atomic absorption spectrophotometer; precision test method; aesthetic instrument ; AA-18001, test tool: copper lamp, cadmium lamp. 5的溶液。 Sample solution: a solution of 0.3 ~ 0. 5A. Blank solution: 0.5% aqueous solution of nitric acid. 2, test method: 1 flame method: the instrument is adjusted to the best state (range, integration time), within 0.3 ~ 0. 5A, the sample solution and the blank solution are continuously alternately measured 11 times. 2 Graphite furnace method: adjust the instrument to the best state, set the temperature program, and measure the sample continuously for 7 times in 0.3~0. 5A. Calculation formula: RSD= S/A x 100% where RSD is precision (relative standard deviation); S is the standard deviation of measurement (related to noise); A is the measured average absorbance. According to China's current metrological verification procedures (JJG) and the former Ministry of Machinery Industry Standards (JB), the flame method standard: Cu precision is 1%; graphite furnace method standard: Cu precision is 4%, Cd The precision is 5%. Key words: atomic absorption spectrophotometer; precision test method; US analytical instrument ; AA-1800