Method for detecting mercury content in nitric acid injection type fluorescent lamp

A detection method, fluorescent lamp technology, applied in the direction of chemical method analysis, measurement device, test sample preparation, etc., can solve the problems that affect the detection accuracy, can not guarantee the collection, and there are many mercury-containing solutions, so as to achieve high measurement accuracy, The effect of saving the amount of nitric acid and labor

Active Publication Date: 2009-02-18
NAT LIGHTING TEST CENT (SHANGHAI) +2
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Problems solved by technology

Although this method uses less mercury than the first method, there is still more mercury-containing solution on the lamp tube residue and in the container. In addition, the condensation process cannot guarantee that all the mercury in the lamp tube will be removed. are collected at the cold end, these factors affect the detection accuracy

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  • Method for detecting mercury content in nitric acid injection type fluorescent lamp

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] The nitric acid injection type fluorescent lamp mercury content detection method of the present invention comprises the following steps: A, the fluorescent lamp tube 1 is frozen at a temperature of -20°C to -1°C for about 4 hours, so that the gaseous mercury in the lamp tube 1 becomes liquid or solid; B, after taking out the frozen lamp tube 1, immediately punch 2 small holes on a drill press with an emery bit, one hole is the nitric acid injection hole 2, and the other is the air outlet hole 3; C, after punching the hole After injecting 10~100ml of nitric acid, the two holes are blocked with silica gel. According to a preferred embodiment of the present invention, use a volumetric flask (100ml ± 0.2ml; 50ml ± 0.1ml) or a graduated pipette ( 10ml±0.05ml) to accurately measure the nitric acid capacity at an ambient temperature of 25°C±1°C; D. Plac...

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Abstract

The invention discloses a mercury content detection method for a nitrate injection fluorescent lamp, which is characterized in that the method comprises the following steps: A, freezing a fluorescent tube to make the gaseous mercury in the tube turn into liquid or solid; B, drilling two holes on the surface of the tube and enabling the two holes to be communicated with the space inside the tube; C, under an ambient temperature of 25 plus/minus 1 DEG C, injecting the accurately measured nitric acid into one hole, and then blocking the two holes with silica gel; D, after the silica gel is solidified, swinging the tube and enabling the mercury in fluorescent lamp to be fully reacted with the nitric acid; E, removing the silica gel and pouring out the mercury-containing nitric acid solution in the tube; and F, measuring the mercury content per unit volume and multiplying the mercury content per unit volume by the total amount of the injected nitric acid so as to obtain the total mercury content of the fluorescent tube. The invention saves cost and reduces harmful emissions, and is provided with high measurement precision.

Description

Technical field: [0001] The invention relates to a method for detecting mercury content in a fluorescent lamp, in particular to a method for detecting mercury content in a nitric acid injection type fluorescent lamp. Background technique: [0002] Mercury is a highly toxic element, so it is a prohibited element in most cases. Since July 1, 2006, the European Parliament and the Council of the European Union promulgated and officially implemented the "Restriction on the use of Certain Hazardous Substances Directive, namely the RoHS Directive, lists mercury as six toxic elements. However, in gas discharge fluorescent lamps, no non-toxic or low-toxic element that can replace mercury has been found so far. Therefore, the RoHS directive stipulates the use of mercury in fluorescent lamps. The regulations that will be promulgated and implemented in my country are basically similar. To the RoHS directive. In order to implement the RoHS directive, a problem of how to correctly measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N1/28
Inventor 杨樾俞安琪强耀根陈颖
Owner NAT LIGHTING TEST CENT (SHANGHAI)
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