A kind of test method of sulfate ion content in sea sand

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

Active Publication Date: 2020-08-11
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

[0028] 1.1 Instruments and reagents

[0029] Metrohm China Co., Ltd. Metrohm 883 Ion Chromatography 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 Hydrochloric acid (analytical pure); Phosphoric acid (analytical pure); Perchloric acid (analytical pure); Company (both passed through a sieve with a sieve size of 160 μm)

[0030] 1.2 Pretreatment of sea sand samples: Accurately weigh 5.0010g of sea sand samples, add 30mL of hydrochloric acid (1+1) into a 100mL beaker, ultrasonically oscillate on an ultrasonic oscillator for 10min, then add it to a 10mL centrifuge tube, at 2000r / min Centrifuge for 30 minutes at a high speed, take the supernatant and pass through a 0.22 μm water phase filter membrane to obtain the sample to be tested; (take the processed sample to be tested, add dilute hydrochloric acid, no precipitation and bubble generation (exclu...

Embodiment 2

[0035] 1.2 Sea sand sample pretreatment: Accurately weigh 7.0026g of sea sand sample, add 50mL of phosphoric acid into a 100mL beaker, ultrasonically oscillate 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 through a 0.22 μm aqueous phase filter membrane to obtain the sample to be tested;

[0036] 1.4 Sample test

[0037] 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 30°C, injection volume is 20μL, flow rate The eluent contains 5mmol / L p-hydroxybenzoic acid and 1.2mmol / L boric acid, and the solvent is water.

[0038]Others are the same as in Example 1. The measured sulfate content in sea sand is 0.30%, and the relative standard deviation is 0.12%. ,

Embodiment 3

[0040] 1.2 Pretreatment of sea sand samples: Accurately weigh 9.9982g of sea sand samples, add 70mL of phosphoric acid into a 100mL beaker, ultrasonically oscillate on an ultrasonic oscillator for 20min, then add to a 10mL centrifuge tube, centrifuge at 5000r / min for 10min, Take the supernatant and pass through a 0.22 μm aqueous phase filter membrane to obtain the sample to be tested;

[0041] 1.4 Sample test

[0042] 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°C, injection volume is 30μL, flow rate The eluent contains 5mmol / L p-hydroxybenzoic acid, 1.2mmol / L boric acid, and the solvent is water.

[0043] Others are the same as in Example 1. The measured sulfate content in sea sand was 0.16%, and the relative standard deviation was 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 in particular relates to a method for testing the content of sulfate ions in sea sand. Background technique [0002] The continuous expansion of my country's construction scale has led to an increasing demand for construction sand. Due to the constraints of resources and the environment, 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 after oil and natural 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 salts and sulfates. Sea sand is used in concrete fine aggregates. These components will affect the strength and durability of concrete to varying degrees. Therefore, the country has promulgated relevant standards, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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