Gold Analysis with a Hydrazine Test Kit
A gold analysis with a hydrazine test kit is based on the reduction of dissolved gold ions (Au³⁺) to elemental gold (Au⁰) by hydrazine. This precipitates fine gold powder, which can then be weighed or visually assessed. Here is a typical procedure:
- preparation of the gold solution
- A sample containing gold (e.g. ores, alloys) is dissolved in aqua regia (HCl + HNO₃) or another suitable acid to bring gold ions into solution.
- If interfering metals are present, prior selective precipitation or separation may be necessary.
- reduction with hydrazine
- The gold solution is prepared in a chemically stable container (e.g. glass or plastic).
- A pH adjustment may be necessary (often slightly acidic to neutral).
- Hydrazine hydrate (N₂H₄-H₂O) is slowly added to the solution. Hydrazine reduces the gold ions
- Elemental gold precipitates as a brown to black precipitate.
- gold extraction and analysis
- The precipitate is separated from the solution by filtration or centrifugation.
- After drying, the gold can be weighed or further tested for purity (e.g. by X-ray fluorescence analysis or melting tests).
Advantages of the hydrazine test
- High selectivity for gold compared to many other metals.
- Simple handling without expensive analytical equipment.
- Visible detection reaction, as elemental gold precipitates.
Hydrazine Test Kit
Testoval Hydrazine Test Kit – manual analysis of hydrazine content Testoval Hydrazine color comparison test kit for fast manual analysis of hydrazine content in water in the concentration range of 0–1 mg/l N2H4. The scope of delivery includes reagents as well as a color comparator for simple concentration determination. The Testoval Hydrazine test kit is used for the fast manual determination of hydrazine (N₂H₄) in water samples. The analysis is carried out via a chemical reaction with reagents that produce a visible color change. The hydrazine concentration can then be reliably determined through optical comparison in the comparator. In addition to the reagents, the scope of delivery also includes a color comparator for concentration determination, a measuring tube, and a measuring spoon. Advantages of the Hydrazine Test Kit from Heyl The complete test kit with reagents and color comparator is ideal for mobile use thanks to its compact design. Hydrazine can be determined quickly and easily via optical color comparison. No electronic measuring device is required. Possible application areas of the test kit The hydrazine test kit can be used in various fields. It is primarily used for determining hydrazine in water samples but can also be used for simple gold analyses due to the chemical reaction. Technical data of the Testoval Hydrazine Test Kit from Heyl Number of analyses: approx. 100 Measurement time: approx. 2 minutes Measuring range: 0–1 mg/l N₂H₄ Readable values: 0 mg/l, 0.05 mg/l, 0.1 mg/l, 0.25 mg/l, 0.5 mg/l and 1 mg/l Order the Testoval Hydrazine Reagents Refill Pack conveniently online As an alternative to the complete test kit, you can also order the Testoval Hydrazine reagents refill pack. This saves costs, as you do not need to purchase the entire test kit again. The refill pack contains 2 bottles of reagents with 52 ml each. Item number: 410557 Testoval Hydrazine Reagents Refill Pack Item number: 410558 Replacement Color Comparator TESTOVAL Hydrazine
Testoval Hydrazine Reagents Refill Pack Testoval Hydrazine reagents refill pack for fast and manual analysis of hydrazine content in water in the concentration range of 0–1 mg/l N2H4. The individual values 0 mg/l, 0.05 mg/l, 0.1 mg/l, 0.25 mg/l, 0.5 mg/l and 1 mg/l can be read by optical color comparison. The Testoval Hydrazine reagents refill pack is used to replenish existing Testoval Hydrazine test kits from Heyl. With the included reagents, you can determine the hydrazine content in water samples quickly and reliably – without having to purchase a completely new test kit. The scope of delivery includes two reagents with 52 ml each, which are sufficient for approximately 100 analyses. Advantages of the Testoval Hydrazine Refill Pack from Heyl The Testoval Hydrazine refill pack is a practical refill solution for existing Testoval Hydrazine test kits. The refill pack is cost-efficient, as there is no need to purchase a new test kit. Possible application areas of the reagents Possible application areas include the monitoring of hydrazine in boiler and feed water, the supervision of water treatment plants, as well as routine laboratory analyses. It is also suitable for analyses of industrial and process water and for quality control in energy and power plant systems. You can also order the complete Testoval Hydrazine test kit in our online shop. As an alternative to the refill pack, you can also order the complete test kit directly in our shop. It includes the reagents, the color comparator, as well as the cuvette, measuring tube and measuring spoon. Item number: 410556 Testoval Hydrazine Test Kit Gold Analysis with a Hydrazine Test Kit