HKL-629 Spectrophotometer for Determination of manganese in steel
Overview
HKL-629 Spectrophotometric for Determination of manganese in steel conforms to the ISO 629 Steel and cast iron — Determination of manganese content — Spectrophotometric method. This International Standard specifies a spectrophotometric method for the determination of manganese in steel and cast iron. The method is applicable to products having manganese contents between 0.001 and 4 % (m/m).
Applications
Determination of manganese (and carbon, phosphorus, copper, nickel, vanadium, chromium, boron, sulfur) content in steel.
Principle
A steel sample of known mass is dissolved in a mixed acid consisting of nitric acid, sulfuric acid, and phosphoric acid. The following chemical reactions occur:
Fe + 6HNO3 = Fe(NO3)3 + 3NO2↑ + 3H2O
Mn + 4HNO3 = Mn(NO3)2 + 2NO2↑ + 2H2O
Fe3+ + 2H3PO4 = [Fe(H2PO4)2]+ + 2H+
2Mn2+ + 5S2O82- + 8H2O = 2MnO4- + 10SO42- + 16H+
The resulting MnO4- solution is measured for absorbance at a wavelength of 530 nm using a spectrophotometer, with a blank sample as the reference solution.
A series of standard MnO₄⁻ solutions with known concentrations are prepared and treated under the same conditions, and their absorbance values are measured using the spectrophotometer. A calibration curve (working curve) is plotted with absorbance (A) on the y-axis and standard solution concentration (c) on the x-axis.
By referring to this calibration curve, the concentration corresponding to the sample solution’s absorbance can be determined, allowing the manganese content in the steel sample to be calculated.
Instruments and Reagents
Instrument: HKL-629 Spectrophotometric for Determination of manganese in steel, Analytical balance, Volumetric flask (50 ml), Pipette (10 ml), Graduated pipette (5 ml), Dropper, Rubber bulb (for pipetting), Alcohol lamp
Reagents: HNO3-H2SO4-H3PO4 Mixture (1:1:1 ratio), 1% AgNO3 (silver nitrate solution), KMnO4 standard solution (Mn 1 mg·ml⁻¹), (NH4)2S2O8 (15%), Steel sample
Test Procedure
Preparation of Standard KMnO4 Solutions
Using a pipette, transfer 10 ml of the standard KMnO4 solution into a 100 ml volumetric flask, then dilute to the mark with deionized water. Seal the flask and mix well. Next, take six 50 ml volumetric flasks. Using a pipette (or graduated pipette), add the prepared standard KMnO4 solution, mixed acid, (NH4)2S2O8, and AgNO3 to each flask. Dilute to the mark with deionized water, seal the flasks, and mix thoroughly.
Steel Sample Preparation and Solution Preparation
Weigh 60–80 mg of the steel sample accurately using an analytical balance and transfer it into a 50 ml beaker. Add 17 ml of mixed acid and heat on a low-temperature hot plate in a fume hood to dissolve the sample.
Once brown NO2 gas ceases to evolve, add 10 ml of (NH4)2S2O8 and 3 ml of AgNO3 solution, and then continue heating until boiling. After boiling for 1 minute, remove from heat. Allow the solution to cool to room temperature, and then transfer it completely into a 50 ml volumetric flask.
Dilute to the mark with deionized water, seal the flask, and mix well.
Absorbance Measurement
Set the spectrophotometer wavelength to 530 nm. Using a 0.5 cm cuvette, measure the absorbance of the five standard KMnO4 solutions and the steel sample solution.
FAQ
Q1: Which standard does this product (HKL-629 Spectrophotometer for Determination of manganese in steel) conform to?
A: HKL-629 Spectrophotometric for Determination of manganese in steel conforms to the ISO 629 Steel and cast iron — Determination of manganese content — Spectrophotometric method. This International Standard specifies a spectrophotometric method for the determination of manganese in steel and cast iron. The method is applicable to products having manganese contents between 0.001 and 4 % (m/m).
Q2: Working principle of HKL-629 Spectrophotometer for Determination of manganese in steel?
A: Dissolution of a test portion in sulphuric-phosphoric acid mixture and nitric acid. Treatment of the test solution with perchloric acid. Formation of the permanganate ion by sodium periodate. Spectrophotometric measurement of the test solution at wavelength of about 545 nm.
Q3: What kind of customer support can I expect after purchasing?
A: We are committed to providing you with a comprehensive and reliable after-sales support system throughout the entire product lifecycle. This includes: (1) Rapid Response: A professional customer service team is always on standby to ensure your needs receive timely feedback. (2) Professional Technical Engineer Support: An experienced team of engineers provides remote diagnostics and on-site services to quickly resolve technical challenges. (3) Continuous Empowerment: We offer long-term online training and guidance to help your team fully leverage the instrument’s capabilities.Our goal extends far beyond simply solving problems. We strive to be a laboratory partner you can trust, ensuring stable instrument operation and accurate, reliable data so you can better focus on your scientific research itself.
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A: Of cause. Please submit your requirements via the contact page on our official website or customer service email, and we will contact you within 24 hours with a detailed quotation.
Q5: What is the minimum order quantity? How long is the delivery lead time?
A: The minimum order quantity is one unit, and delivery is approximately 20 days after advance payment.
About us
Hong Kong Laboratory Technology Limited specializes in supply chain integration and full-chain technical services for laboratory instruments. With years of industry expertise, our company operates under a stringent quality management system, complying with multiple international standards including ISO 9001, ASTM, and IP requirements. The core products not only comply with the ISO/IEC 17025 instrument calibration and testing standards, but are also widely used in research institutions, petrochemical andmining industries, medical institutions,and environmental protection departments. This high-standard quality has earned broad market and customer trust.
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International Certification
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ISO 9001 Certification | ASTM Certificate |
