Detection method of lead content in gasoline

Abstract

The invention relates to a detection method of lead content in gasoline, comprising the following steps: preparing solution, preparing lead standard solution, preparing sample to be detected, drawingstandard curve and detecting the lead content in the gasoline. Compared with GB / T8020, the invention adopts glacial acetic acid-methyl isobutyl ketone solution with mass concentration of 3.0%, improves the stability of a dilution dissolvent system, reduces preparation times of the standard solution, saves resources and avoids environment pollution and hazards to personnel; no lead-poor gasoline isadded in the preparation of the standard solution to reduce the detection limit of the method to 0.02mg / L (0.0428), thus satisfying the need of actual analysis and detection and ensuring the accuracyof data. The detection method used for detecting the same test sample has the advantages of smaller relative standard deviation, high sensitivity and longer stable storage time of work standard solution which can still meet analysis requirement even after being stored for 30 days.

Description

technical field [0001] The invention belongs to the technical field of testing or analyzing materials by means of measuring their chemical or physical properties, and in particular relates to testing the content of lead in gasoline. Background technique [0002] GB17930-2006 "Automotive Gasoline" stipulates that the test method for the determination of lead content is GB / T8020 "Determination of Lead Content in Gasoline (Atomic Absorption Spectrometry)". The main defects of the method: one is that the standard solution used in this method needs to be ready-to-use, and the preparation time is longer, and it takes 10 hours to prepare a standard solution; secondly, the standard solution is easy to fade after exposure to light or storage, and chemical changes occur. The solution cannot be used again and can only be discarded, causing waste and polluting the environment; moreover, the dilution solvent adopts methyl isobutyl ketone, which belongs to toxic substances, and it can sti...

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Problems solved by technology

[0002] The test method for the determination of lead content specified in GB17930-2006 "Gasoline for Motor Vehicles" is GB / T8020 "Determination of Lead Content in Gasoline (Atomic Absorption Spectrometry)". The main defects of the method are as follows: the first is that the standard solution used in this method needs to be ready-to-use, and the preparation time is relatively long, and it takes 10 hours to prepare a standard solution; secondly, the standard solution is easy to fade when exposed to light or stored, and chemical changes occur. The solution cannot be used again and can only be discarded, causing waste and polluting the environment; moreover, the dilution solvent adopts methyl isobutyl ketone, which belongs to toxic substances, and it can stimulate people's eyes and respiratory system on mucous membranes. Long-term contact with this reagent threatens the operation physical health

In addition, GB17930-2006 "Automotive Gasoline" stipulates that the lead content in gasoline is not more than 0.005g / L, while GB / T8020 "Determination of Lead Content in Gasoline (Atomic Absorption Spectrometry)" has a measurement range of 2.5~25mg / L, With the unleaded gasoline, the lower detection limit of this method can no longer meet the needs of actual analysis and detection

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