ISO 7837:1992

Name: ISO 7837:1992 — Fertilizers — Determination of bulk density (loose) of fine-grained fertilizers
SKU: ISO 7837:1992
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Fertilizers — Determination of bulk density (loose) of fine-grained fertilizers

Название (английский):

ISO 7837:1992

Fertilizers — Determination of bulk density (loose) of fine-grained fertilizers

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 9 июля 1992 г.
Издание:: ISO IS 7837 edition 2 version 1
ICS:: 65.080

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Описание (английский):

The method is applicable to fertilizers, dry only, which contain a large proportion of particles of diameters less than 0,5 mm. Its principle is pouring the fertilizer from a specified filling device into a specified measuring cylinder of known volume and weighing the contents of the cylinder. If the fertilizer has absorbed moisture during transport or storage, it is necessary to dry it in an environmental chamber.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7837:1992 is an international standard developed by the International Organization for Standardization (ISO) that specifies a precise method for determining the bulk density (loose) of fine-grained fertilizers. This standard is particularly applicable to dry fertilizers with a high proportion of particles smaller than 0.5 mm in diameter. Bulk density is defined as the mass per unit volume of material after freely tipping it into a container under specified conditions. Accurate measurement of bulk density is crucial for quality control, packaging, transport, and application of fertilizers.

Key Topics

Scope and Applicability
The method targets fine-grained fertilizers where a significant portion of particles is less than 0.5 mm. It addresses challenges faced by other bulk density methods unsuitable for such fine materials, which tend to clog or create air cavities affecting measurement accuracy.

Principle of the Method
Bulk density (loose) is determined by pouring fertilizer from a specified filling device into a calibrated measuring cylinder of known volume and weighing the material inside the cylinder. Dry conditions are essential; fertilizers absorbing moisture during storage or transport must be dried in a controlled environment before testing.

Apparatus Specifications
The apparatus includes a spring-suspended locking filling device, a dust-tight intermediate piece with a hinged cover, and a measuring cylinder with a volume of 1000 ± 5 cm³. The construction materials must be corrosion-resistant, such as glass or specific plastics, to withstand fertilizer properties and avoid contamination.

Test Procedure
The fertilizer sample is poured to the brim of the filling device, released by unlocking the hinged cover, and allowed to fill the measuring cylinder. After settling, surplus material is scraped off carefully before weighing. Two successive measurements are taken to ensure repeatability, with an acceptable variation of no more than 0.02 g/cm³ between results.

Calculation and Expression of Results
Bulk density values are calculated by dividing the mass of the fertilizer in the measuring cylinder by the known volume of the cylinder (grams per cubic centimeter). The final reported figure is the arithmetic mean of two determinations.

Applications

Quality Control in Fertilizer Production
Ensuring the consistent physical properties of fertilizers aids manufacturers in maintaining product standards and manufacturing processes.

Logistics and Storage Management
Bulk density data assist in optimizing packaging sizes, estimating storage volume requirements, and transport efficiency.

Agricultural Usage
Accurate bulk density measurements enable farmers and distributors to calculate correct fertilizer application rates based on weight-to-volume ratios for effective soil nutrient management.

Regulatory Compliance and Trade
Adherence to ISO 7837 facilitates standardized reporting and uniformity in international trade, minimizing disputes regarding fertilizer quality and characteristics.

Related Standards

ISO 3944:1992 – Determines the bulk density (loose) of solid fertilizers with particle sizes from about 0.5 mm to 5 mm. This standard is suitable for coarser fertilizers and complements ISO 7837.

ISO 7742:1988 – Covers reduction of solid fertilizer samples to representative test portions, essential for consistent sample preparation.

ISO 8358:1991 – Details sample preparation procedures for physical and chemical analyses of solid fertilizers, ensuring accuracy before bulk density testing.

Summary

ISO 7837:1992 offers a robust and repeatable procedure for measuring the bulk density of fine-grained dry fertilizers. The standard addresses unique testing challenges posed by fine particle sizes and ensures highly accurate, reliable results essential for fertilizer manufacturing, quality assurance, and agricultural application. Utilizing this standardized method enhances consistency, safety, and efficiency within the fertilizer industry worldwide.

Keywords: ISO 7837, fertilizer bulk density, fine-grained fertilizers, bulk density measurement, fertilizer quality testing, dry fertilizer analysis, sample preparation, fertilizer standardization.

ISO 7837:1992

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Summary

Технические детали

ISO 3944:1992

Fertilizers — Determination of bulk density (loose)

ISO 7742:1988

Solid fertilizers — Reduction of samples

ISO 8358:1991

Solid fertilizers — Preparation of samples for chemical and physical analysis