Testing method for content of sulfate ions in sea sand

A technology of sulfate ion and testing method, which is applied in the field of testing sulfate ion content in sea sand, can solve time-consuming problems, achieve enhanced separation effect, accurate and reliable results, and high testing efficiency

Active Publication Date: 2018-11-23
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In GB / T 14684-2011 "Sand for Construction" and JGJ 52-2006 "Standards for the Quality and Inspection Methods of Sand and Stone for Ordinary Concrete", the inspection of sulfide and sulfate content is based on the barium sulfate gravimetric method, which is time-consuming. Moreover, there are certain measurement errors in the test; sea sand is an insoluble solid sample, and the sulfate in sea sand is wrapped in sea sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1.1 Instruments and reagents

[0030] Metrohm China Co., Ltd. Metrohm 883 ion chromatograph system; IonPac AS17-C anion analysis column; IonPac AG17-C guard column; AERS300 4mm anion suppressor; METTLER TOLEDO Instruments (Shanghai) Co., Ltd. electronic analytical balance ; Sulfate standard stock solution; hydrochloric acid (analytical purity); phosphoric acid (analytical purity); perchloric acid (analytical purity); distilled water laboratory self-made; the samples used are sea sand samples 1#, 2#, 3#, purchased from a Company (both through a sieve with a mesh size of 160μm)

[0031] 1.2 Pretreatment of sea sand sample: accurately weigh 5.0010g sea sand sample, add 30mL hydrochloric acid (1+1) into a 100mL beaker, oscillate ultrasonically on an ultrasonic oscillator for 10min, and then add it to a 10mL centrifuge tube at 2000r / min Centrifuge for 30 minutes at a speed of 30 minutes, and take the supernatant through a 0.22μm water phase filter membrane to obtain the sample t...

Embodiment 2

[0036] 1.2 Pretreatment of sea sand sample: accurately weigh 7.0026g sea sand sample, add 50mL phosphoric acid to a 100mL beaker, ultrasonically shake on an ultrasonic oscillator for 15min, then add it to a 10mL centrifuge tube, centrifuge at 3000r / min for 20min, Take the supernatant and pass it through a 0.22μm water phase filter membrane to obtain the sample to be tested;

[0037] 1.4 Sample test

[0038] The chromatographic conditions are: IonPac AS17-C anion analysis column, 4×250mm, IonPacAG17-C guard column, 4×50mm, AERS300 4mm anion suppressor, conductivity detector, chromatographic column temperature is 30℃, injection volume is 20μL, flow rate It is 1.0mL / min, the eluent contains 5mmol / L p-hydroxybenzoic acid, 1.2mmol / L boric acid, and the solvent is water.

[0039] Others are the same as in Example 1. The measured sulfate content in the sea sand is 0.30%, and the relative standard deviation is 0.12%. ,

Embodiment 3

[0041] 1.2 Sea sand sample pretreatment: accurately weigh 9.982g sea sand sample, add 70mL phosphoric acid to a 100mL beaker, ultrasonically shake on an ultrasonic oscillator for 20min, then add it to a 10mL centrifuge tube, centrifuge at 5000r / min for 10min, Take the supernatant and pass it through a 0.22μm water phase filter membrane to obtain the sample to be tested;

[0042] 1.4 Sample test

[0043] The chromatographic conditions are: IonPac AS17-C anion analysis column, 4×250mm, IonPacAG17-C guard column, 4×50mm, AERS300 4mm anion suppressor, conductivity detector, column temperature is 40℃, sample volume is 30μL, flow rate It is 0.8mL / min, the eluent contains 5mmol / L p-hydroxybenzoic acid, 1.2mmol / L boric acid, and the solvent is water.

[0044] Others are the same as in Example 1. The measured sulfate content in sea sand is 0.16%, and the relative standard deviation is 0.09%.

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PUM

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Abstract

The invention discloses a testing method for the content of sulfate ions in sea sand. The testing method comprises the following steps: (1) taking the sea sand and sieving to obtain a sea sand sievedsubstance, i.e., a sea sand sample; (2) pre-treating the sea sand sample; (3) drawing a standard working curve; (4) carrying out ion chromatographic analysis and result calculation. According to the testing method disclosed by the invention, the sea sand sample is pre-treated by adopting ultrasound, vibration and centrifuging; the sulfate ions in the sea sand are sufficiently dissolved in a solvent through multi-effects of the ultrasound, the vibration and the centrifuging; operation steps are simple and rapid and the testing efficiency is high. The testing method takes inorganic acid as a solvent, so that the sulfate ions in the sea san are completely dissolved out; measurement errors are avoided and a testing result is real and reliable.

Description

Technical field [0001] The invention belongs to the technical field of building material detection, and particularly relates to a method for testing the sulfate ion content in sea sand. Background technique [0002] The continuous growth of the construction scale in my country has resulted in an increasing demand for construction sand. Due to resource and environmental constraints, river sand is far from meeting the demand for construction sand, and sea sand has become an important part of construction sand. Sea sand, as the second largest marine mineral next to oil and gas, is an important raw material for engineering construction and plays an important role in large-scale engineering construction. Sea sand contains various salts such as chloride and sulfate. When sea sand is used in concrete fine aggregate, these components will have varying degrees of impact on the strength and durability of concrete. Therefore, the country has promulgated relevant standards, such as my count...

Claims

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Application Information

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IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 李格丽方云辉柯余良郭元强
Owner KZJ NEW MATERIALS GROUP CO LTD
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