YS/T 575.5-2007Methods for chemical analysis of bauxite. Part 5: Determination of iron oxide content. Orthophenanthroline photometric method (English PDF)

Foreword

YS/T 575-2007 Methods for Chemical Analysis of Bauxite is a modification to YS/T

575-2006 (formerly GB/T 3257-1999). It has 24 parts in total.

--- Part 1.Determination of aluminum oxide content - EDTA titrimetric method;

--- Part 2.Determination of silicon dioxide content - Gravimetric-molybdenum blue

photometric method;

--- Part 3.Determination of silicon dioxide content - Molybdenum blue photometric

method;

--- Part 4.Determination of iron oxide content - Potassium titrimetric method;

--- Part 5.Determination of iron oxide content - Orthophenanthroline photometric

method;

--- Part 6.Determination of titanium dioxide content - Diantipyrylmethane

photometric method;

--- Part 7.Determination of calcium oxide content - Flame atomic absorption

spectrophotometric method;

--- Part 8.Determination of magnesium oxide content - Flame atomic absorption

spectrophotometric method;

--- Part 9.Determination of potassium oxide, sodium oxide content - Flame atomic

absorption spectrophotometric method;

--- Part 10.Determination of manganese oxide content - Flame atomic absorption

spectrophotometric method;

--- Part 11.Determination of chromium oxide content - Flame atomic absorption

spectrophotometric method;

--- Part 12.Determination of vanadium pentoxide content - N-benzoyl-N-

phenylhydroxylamine photometric method;

--- Part 13.Determination of zinc content - Flame atomic absorption

spectrophotometric method;

--- Part 14.Determination the total content of rare earth oxide Tribromo-arsenazo

photometric method;

--- Part 15.Determination of gallium oxide content - Rhodamine B-extraction

photometric method;

--- Part 16.Determination of phosphorus pentoxide content - Molybdenum blue

spectrophotometric method;

--- Part 17.Determination of sulfur content - Direct combustion-iodometric method;

--- Part 18.Determination of total carbon content - Non-aqueous titrimetric method

after combustion;

--- Part 19.Determination of the loss on ignition - Gravimetric method;

--- Part 20.Preparation of pre-dried sample;

--- Part 21.Determination of organic carbon content titrimetric method;

--- Part 22.Determination of hydroscopic moisture in analytical samples -

Gravimetric method;

--- Part 23.Determination of element contents X-ray fluorescence spectrometric

method;

--- Part 24.Determination of carbon content and sulfur content - Infrared absorption

method.

This Part is Part 5.

This Part replaces YS/T 575.5-2006 (formerly GB/T 3257.5-1999).

This Part revises YS/T 575.5-2006.Compared with YS/T 575.5-2006, this Part has the

major changes as follows.

--- Change the concentrations of orthophenanthroline solution and hydroxylamine

hydrochloride solution;

--- Supplement the provisions of color-development temperature and time;

--- Unify the drying temperature of the specimen to be 110°C±5°C;

--- Add the precision.

This Part was proposed by and under the jurisdiction of National Technical Committee

on Non-ferrous Metals of Standardization Administration of China.

Chief drafting organization of this Part. China Aluminum Corporation Zhengzhou

Research Institute.

Drafting organization of this Part. China Aluminum Corporation Guizhou Branch.

Chief drafting staffs of this Part. Wang Baosheng, and Li Xiong.

This Part shall be interpreted by National Technical Committee on Non-ferrous Metals

of Standardization Administration of China.

The historical edition replaced by this Standard is as follows.

--- YS/T 575.5-2006 (formerly GB/T 3257.5-1999).

Methods for Chemical Analysis of Bauxite -

Part 5.Determination of Iron Oxide Content -

Orthophenanthroline Photometric Method

1 Scope

This Part specifies the determination of ferric oxide content in the bauxite.

This Part is applicable to the determination of ferric oxide content in the bauxite; the

determination range. <=5.00%.

2 Method Principle

The specimen is melted by alkali, leached by hydrochloric acid; and the ferric iron is

reduced to ferrous iron with hydroxylamine hydrochloride under appropriate acidity. In

an acetate buffer medium, ferrous iron and orthophenanthroline form a colored

complex. The absorbance is measured at a wavelength of 510 nm.

3 Reagents

4 Apparatus

Spectrophotometer.

5 Specimen

Grind the specimen by a mortar and pass through a 74µm sieve; dry the ground

specimen at 110°C±5°C for 2h;

6 Analytical Procedures

7 Calculation of Analysis Results

Calculate the mass fraction (%) of ferric oxide as per the following Formula.

8 Precision

9 Quality Assurance and Control

In analysis, use standard sample or control sample to verify. Or, use standard sample

or control sample to verify the analysis method at least once a year. When the process

is out of control, it shall find out the reason.

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