CN-121978142-A - Method for detecting content of ammonium sulfate in ABC dry powder extinguishing agent

CN121978142ACN 121978142 ACN121978142 ACN 121978142ACN-121978142-A

Abstract

The invention relates to a method for detecting the content of ammonium sulfate in ABC dry powder extinguishing agent, which comprises the steps of firstly qualitatively judging whether a sample contains ammonium sulfate or not through X-ray diffraction; and then measuring the total ammonia nitrogen content by adopting a Naviet reagent spectrophotometry, measuring the monoammonium phosphate content by adopting a gravimetric method, measuring the ammonia nitrogen content of an interference component by adopting an ion chromatography method, and finally calculating the ammonium sulfate content according to conservation of nitrogen. The method can effectively remove impurity interference, has accurate and reliable detection result and high precision (RSD is less than or equal to 2%), ensures that the standard recovery rate is between 98.50 and 102.44%, fills the blank of the national standard ammonium sulfate detection method, and is suitable for quality control and market supervision of ABC dry powder fire extinguishing agents.

Inventors

ZHANG GUANGYU
YANG CHUANG
CHEN DONG
TU YONG
WANG XIAOGE
LIU QING
ZHANG YING
CHEN HANGFENG
Ma Yuanen

Assignees

浙江方圆检测集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (6)

1. The method for detecting the content of ammonium sulfate in the ABC dry powder extinguishing agent is characterized by comprising the following steps of: 1) Performing qualitative analysis on the ABC dry powder extinguishing agent sample by adopting X-ray diffraction, and judging whether ammonium sulfate and other ammonium salts are contained; 2) Measuring the total ammonia nitrogen content of the ABC dry powder extinguishing agent sample by adopting a Nahner reagent spectrophotometry, and marking as X 1 ; 3) Measuring the content of monoammonium phosphate in the ABC dry powder extinguishing agent sample by adopting a weight method, and marking the content as X 2 ; 4) Measuring the ammonia nitrogen content of the interference component in the ABC dry powder extinguishing agent sample by adopting an ion chromatography method, and marking as X 3 ; 5) The ammonium sulfate content was calculated from the conservation of nitrogen and designated as X 4 .
2. The method for detecting the ammonium sulfate content in the ABC dry powder extinguishing agent according to claim 1, wherein in the step 1), if characteristic diffraction peaks which are completely matched with ammonium sulfate standard cards appear in the sample X-ray diffraction patterns and the relative intensity proportion of the characteristic peaks is consistent, the subsequent quantitative detection is carried out.
3. The method for detecting the content of ammonium sulfate in ABC dry powder extinguishing agent according to claim 1, wherein the total ammonia nitrogen content in the step 2) is as follows The calculation formula of (2) is as follows: ; Wherein c 1 is the concentration (mg/L) of ammonia nitrogen in the solution to be detected, and m 0 is the sample mass (g).
4. The method for detecting the content of ammonium sulfate in ABC dry powder extinguishing agent according to claim 1, wherein the content of monoammonium phosphate in the step 3) is as follows The calculation formula of (2) is as follows: ; Wherein m 1 is the mass (g) of the deposition of the quinoline phosphomolybdate, m 0 is the mass (g) of the sample, and 1.0396 is the coefficient of conversion of the quinoline phosphomolybdate into monoammonium phosphate.
5. The method for detecting the ammonium sulfate content of ABC dry powder extinguishing agent according to claim 1, wherein the ammonia nitrogen content of the interfering component in the step 4) is as follows The calculation formula of (2) is as follows: ; Wherein c 2 is the concentration (mg/L) of the interfering component anions in the solution to be detected, m 0 is the sample mass (g), and ω 1 is the ratio of the atomic mass of ammonia nitrogen in the interfering component to the relative molecular mass of the anions in the interfering component.
6. The method for detecting the content of ammonium sulfate in ABC dry powder extinguishing agent according to claim 1, wherein the calculation formula of the content of ammonium sulfate in the step 5) is as follows: 。

Description

Method for detecting content of ammonium sulfate in ABC dry powder extinguishing agent Technical Field The invention belongs to the technical field of fire control detection, and particularly relates to a detection method for ammonium sulfate content in ABC dry powder extinguishing agent. Background ABC dry powder extinguishing agent is widely applied to various fire prevention and control scenes such as buildings, industrial sites and the like because of the advantages of wide applicable fire types, high extinguishing efficiency, good storage stability and the like. The main formula of the fire extinguishing efficiency core depends on the content ratio of main components, namely 75% ammonium dihydrogen phosphate (NH 4H2PO4) and 15% ammonium sulfate ((NH 4)2SO4), wherein the ammonium sulfate can obviously improve the fire extinguishing efficiency of B, C fire and improve the crushing performance of ammonium phosphate, is a key component for guaranteeing the quality of the fire extinguishing agent, the national standard GB 4066-2017 dry powder fire extinguishing agent clearly prescribes a detection method of the ammonium dihydrogen phosphate in the ABC dry powder fire extinguishing agent, but does not prescribe any detection of the ammonium sulfate content, the method for detecting the ammonium sulfate content of the product in the current market is lack of uniform and accurate detection basis, and brings difficulty to product quality supervision, and part of enterprises are likely to be doped with cheap impurities containing ammonia nitrogen and sulfate radical for reducing cost, if a single detection method is adopted, interference is easy to generate, the detection result deviates from a true value, and the quality of the fire extinguishing agent cannot be accurately estimated. Disclosure of Invention Aiming at the problems existing in the prior art, the invention aims to provide a detection method for the content of ammonium sulfate in ABC dry powder extinguishing agent, which provides a combined detection idea of XRD qualitative screening-Nashi reagent spectrophotometry for total ammonia nitrogen-ion chromatography to eliminate interference, and is realized by the following technical scheme: A method for detecting the content of ammonium sulfate in ABC dry powder extinguishing agent, which comprises the following steps: 1) Performing qualitative analysis on the ABC dry powder extinguishing agent sample by adopting X-ray diffraction, and judging whether ammonium sulfate and other ammonium salts are contained; 2) Measuring the total ammonia nitrogen content of the ABC dry powder extinguishing agent sample by adopting a Nahner reagent spectrophotometry, and marking as X 1; 3) Measuring the content of monoammonium phosphate in the ABC dry powder extinguishing agent sample by adopting a weight method, and marking the content as X 2; 4) Measuring the ammonia nitrogen content of the interference component in the ABC dry powder extinguishing agent sample by adopting an ion chromatography method, and marking as X 3; 5) The ammonium sulfate content was calculated from the conservation of nitrogen and designated as X 4. Further, in the step 1), if a characteristic diffraction peak which is completely matched with the ammonium sulfate standard card appears in the sample X-ray diffraction pattern and the relative intensity proportion of the characteristic peak is consistent, the subsequent quantitative detection is carried out. Further, total ammonia nitrogen content in step 2)The calculation formula of (2) is as follows: Wherein c 1 is the concentration (mg/L) of ammonia nitrogen in the solution to be detected, and m 0 is the sample mass (g). Further, the monoammonium phosphate content in step 3)The calculation formula of (2) is as follows: Wherein m 1 is the mass (g) of the deposition of the quinoline phosphomolybdate, m 0 is the mass (g) of the sample, and 1.0396 is the coefficient of conversion of the quinoline phosphomolybdate into monoammonium phosphate. Further, the ammonia nitrogen content of the interfering component in step 4)The calculation formula of (2) is as follows: Wherein c 2 is the concentration (mg/L) of the interfering component anions in the solution to be detected, m 0 is the sample mass (g), and ω 1 is the ratio of the atomic mass of ammonia nitrogen in the interfering component to the relative molecular mass of the anions in the interfering component. Further, the calculation formula of the ammonium sulfate content in the step 5) is as follows: 。 according to the method, the types of impurities containing ammonia nitrogen and sulfate radical in the sample are primarily identified through an XRD technology, then the total ammonia nitrogen content of the sample is measured by adopting a Nahner reagent spectrophotometry, and the indirect accurate conversion of the ammonium sulfate content is realized by combining an ion chromatography. Drawings FIG. 1 is a sample XRD diffraction pattern from exa