This standard specifies that the original granular fertilizer samples obtained shall be prepared into laboratory samples for analysis by operations such as reduction and grinding. This standard is only applicable to compound fertilizers obtained by chemical methods or compound fertilizers made from nitrogen fertilizers, phosphate fertilizers and potash fertilizers as basic fertilizers through secondary processing. GB/T 8571-2002 Preparation of laboratory samples of compound fertilizers GB/T8571-2002 standard download decompression password: www.bzxz.net

rCS 65.080
National Standard of the People's Republic of China
GB/T85712002
Generation 8571-1958
Compound Fertilizer
Preparation of laboratory samples for compound Issued on September 24, 2002
Shandong People's Republic of China
National Quality Inspection and Quarantine Agency
Implementation on April 1, 2003
This standard is one of the series of standards for compound fertilizer test methods. The following are the national standards: GB/8571-2992 Preparation of laboratory samples for temperature-controlled fertilizers 1-3 GB/T8572-20313 Determination of total ion in mixed fertilizers 3-4 GB/T8573-1999 Determination of effective amount of phosphate in fertilizers 4-5 GB8576-2032 Determination of free water content in samples containing fertilizers 3-5 GB/857?-2032 Free water in compound fertilizers Determination of content by Karl-Fischer method 3 This standard replaces G/78571-1588 "Preparation of laboratory samples for compound fertilizers". GB/TB571-2002
This standard differs from GB/T8171-1D%K in the following main aspects: The main differences between this standard and GB/T1.【2002 Standardization Work Guide Part 1: Standard structure and comprehensive rules have been revised in accordance with ... 8571—2002
This standard specifies the use of auxiliary separation, grinding and other operations to prepare the original granular fertilizer samples into laboratory samples for analysis. This standard is only applicable to the liquid fertilizer made by secondary addition of bean or insect fertilizers obtained by chemical methods.
2 PrincipleWww.bzxZ.net
The sample is divided into four parts by a separator or quartering method, and the sample is reduced to the required size by discarding some of the detailed and mixed parts. Then, the sample is passed through the specified sieve holes to obtain a dark and representative laboratory sample for analysis (weighing sample) 3 Instruments
3.1 Grid separator: None Figure 1:|| tt||3.2 grinder or grinder;
3.3 test sieve. The hole is 5.3mnt.1.ccmm, with tray and sieve: 3.4 tray or shovel: H width and grid slot divider (%.1) feed 4 width equal, 4 sample divider
4.1 grid divider divider
groove two receiving alliance respectively in the divider group to receive the sample bone, the de-materialized sample is spread flat on the porcelain salt (or shovel) with two sample trays above the feeder hopper of the divider, as close to the center as possible and feel the father position, forcefully add fertilizer, make it form or layer god material flow, the pre-granulated fertilizer can be straight city, evenly fall into all grid trees. Note: must quickly feed continuously, contain sample kelp in a certain receiver, in order to not get equal length of moving hook, representative sample. Discard! For the sample in the receiver, divide it into smaller parts according to the sample capacity: Repeat this operation until the detailed sample quantity for analysis is obtained (including physical analysis and chemical analysis): if the sample to be divided is small, the two samples obtained from the first division can be divided again into the required samples. If the original sample is larger than the divider capacity, the sample can be divided into ten equal parts first, and then divided and separated in reverse order, discard the sample in one receiver, and mix and divide the detailed sample in the other receiver. The operation should be as fast as possible to avoid sample loss of water or disorder. 4.2 Quartering method
Use a shovel or small tool to scoop the fertilizer on the surface of the dry and tumbled fertilizer into a cone shape, flatten it, and divide the fertilizer sample into four equal parts along two light directions at an angle to each other. Remove the middle part and leave the mixed part. Operate until the required quality is obtained: 4.3 Mix the mixed samples divided in 4.1 and 4.2 evenly. Two sealed through the seal, the label is marked with sample name, date of collection, name of the manufacturer, unit name or code, physical analysis, one bottle is ground for chemical analysis. 5 Sample grinding
All the samples are passed through the 0.mm control end (for wet fertilizers, they can be passed through the hole diameter), the grinding room helps to work quickly to avoid water or absorption during the machine grinding process, and the sample is overheated. The sample point is easy to absorb and is carried out in the following set.
GB/T 85712002
Figure 1 Grid distribution network separator
Modified distribution duct
In order to make the samples uniform, the samples are changed to the axis of the analyzable paper sheet on the north oil sheet, and the samples are moved to the mixed sheet according to different forces. Place the sample in the wide opening for inspection. After the sample is placed, a certain space should be left at the container end, with markings, station name, sampling port markings, and the name of the person who made the sample, unit name or number.
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