I checked the "formula" here, and the absorbance value of 0.3mg/l standard solution is 0.4A If a burner of 100mm is used, the sensitivity will be improved by 40%. The gas flow rate is 0.9- 1.2l/min, and the default value is1.1l/min; Lanthanum solution is 0.65438 0% (m/v); As for the addition amount, I personally think it should be 5ml, so as to ensure that the addition amount of all solutions is consistent.