Method and device for determining the phosphorus content of an aqueous sample

A kind of equipment and carbon content technology, applied in the field of equipment for realizing the method, can solve the problem of unable to quantitatively display phosphorus, etc., and achieve the effect of favorable operation and environmental protection, simple and controllable, and easy to control

CN101646938AActive Publication Date: 2010-02-10拉尔分析仪器股份有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-02-10

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Abstract

The invention relates to a method for determining the phosphorus content of an aqueous sample, particularly a waste water sample, wherein the sample is subjected to thermal-oxidative digestion, and the orthophosphate content of the digested sample is photometrically determined in an aqueous analysis solution, wherein the thermal digestion process is performed in a single stage by catalyst-free combustion of the sample as batch digestion in a furnace, the developing combustion gas is fed in a carrier gas flow to the furnace, and the combustion / carrier gas flow is cooled in order to obtain the aqueous analysis solution as a condensate thereof.
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Description

technical field

[0001] The invention relates to a method for determining the phosphorus content of an aqueous sample according to claim 1, and a device for implementing the method. Background technique

[0002] Determination of the content of specific substances in water and thus of water quality, especially in sewage contaminated with organic materials, nitrogen compounds and / or halogen compounds, by evaporating the sample in air containing an oxygen-enriched transport gas (carrier gas) and combust, and deliver the gas mixture obtained by combustion to detectors suitable for showing the presence of carbon dioxide, nitrogen oxides, etc.

[0003] The following (among other) detectors have proven useful: infrared detectors for the determination of carbon content, specialized chemiluminescent detectors or electrochemical sensors for the determination of nitrogen content, and so-called coulometric detectors for the determination of halide content Detector.

[0004] Detection m...

Examples

Embodiment Construction

[0029] attached figure 1 A sectional view showing the most important parts of a sample combustion furnace 1 for implementing an embodiment of the method according to the invention, inside which is provided a substantially elongated cylindrical ceramic reactor 2 (in the figure its outline indicated by a dotted line). At its lower end (cold end of the furnace) it has a tubular outlet with a diameter between 6 and 10 mm, which can be easily cleaned from below to remove the salt layer.

[0030] The furnace 1 comprises a first upper heating zone 3 in which in this embodiment the maximum temperature can reach 800° C., and a second lower heating zone 4 in which the maximum temperature is 1250°C. The two heating zones are heated by electric heating wires 5 and 6, and the electric heating wires are hollow cylinders made of special high-temperature resistant alloys, that is, ceramic fiber heating materials ( ), and the heating wire is arranged around the section of the respective rea...