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"样品" (12)

The Sample —— 仪器分析前的样品制备
该杂志是一本关于实验室理化分析前的样品制备的应用介绍。
No. 24
Anniversary issue of the RETSCH customer magazine 10 years "the sample"
No. 25
Retsch presents the new Ultra-Centrifugal Mill ZM 200
No. 28
Think big but grind fine!
No. 30
Mills and Particle Analyzers for Environmental Analysis
No. 31
Grand Prix Season 2008 & New RETSCH Instruments
No. 34
PRODUCT NEWS'09
No. 35
NEW PRODUCTS TRIED AND TESTED
No. 36
The Art of Milling - Contemporary Milling Technologies
No. 37
NEW DIMENSIONS in sample preparation and particle analysis
No. 37
UNA NUEVA DIMENSIÓN en la preparación de muestras y análisis granulométrico
Nr. 29
Die Gerätegeneration 2007

专业报道 (24)

Air Jet Sieving of Bulk Materials
Particle size analysis and particle size distribution are important criteria for the quality  control of bulk materials. In a running production process, the results of a quality check must be available quickly to allow for immediate adjustment of the production parameters. Depending on the expected particle size and sample volume, different sieving methods and sieving machines are suitable for analysis. The method used for particle size analysis is primarily determined by the fineness of the material to be sieved. For dry sieving of samples with particle sizes below 40 microns, air jet sieving is the method of choice.
Are cereal bars really healthy?
Food manufacturers often promote their products as „light“ or, such as in the case of cereal bars, „healthy“. If that is actually true, can only be verified by analyzing the nutritional values, a procedure which forms an important part of food quality control. The values of fat, saturated fatty acids, sugar and salt which are printed on the packaging represent an average of the content of each substance and relate to 100 ml respectively 100 g of the product. The cereal bars consist of a heterogeneous mixture of ingredients (nuts, raisins, oat flakes etc.), therefore the thorough homogenization of the sample is required to obtain meaningful analysis results.
Cutting Mill SM 300 - Refinement of a well-proven grinding principle
Cutting mills are used in many different areas of sample preparation for subsequent analyses. Typical applications include the size reduction of secondary fuels, the processing of biomass for renewable energy research, the control of products in the context of RoHS and WEEE regulations or the recovery of precious metals – the variety of sample materials is huge.
Detection of Mycotoxins in Nuts
Preliminary and fine size reduction
Efficient Grinding at –196 °C
RETSCH’s New CryoMill for Safe and Reproducible Grinding with Liquid Nitrogen
Fat Analysis in Food and Feed
Size reduction of samples with a high fat content
From cacao tree to chocolate bar
The way from the cacao tree to the chocolate bar is a long one. Due to the many processing stages – harvest, fermentation, drying, cleaning, roasting, pre-crushing and finally grinding the cocoa nibs to liquor from which cocoa powder and cocoa butter are pressed – there may be significant variations in the quality. The quality control process not only includes testing the innocuousness of the product (e. g. fungi, heavy metal contamination) or the ingredients (fat, carbohydrate content), it also involves size reduction to an adequate particle size for a sensory test of the cocoa liquor. That is important because the human palate perceives particles as small as 30 microns as unpleasant.
New Knife Mill Sets Standards
The so-called QuEChERS method (“quick, easy, cheap, effective, rugged and safe”) has been developed to make sample preparation to pesticide analysis more efficient. Serial tests have proved that the analysis results obtained with the QuEChERS method can easily bear comparison with more common methods, such as DFG S19. To guarantee reproducible analysis results, it is essential to completely homogenize the sample. To make sure the sample preparation is reproducible, the homogenization process needs to be carried out with a laboratory mill.
Perfect Homogenization with the GRINDOMIX GM 300
The diversity of foodstuffs with their often very different product properties represents a real challenge for food testing laboratories. Before the actual analysis, the sample materials – which can vary strongly with regards to hardness and moisture – need to be homogenized and reduced to a sufficiently small particle size. RETSCH’s GRINDOMIX knife mills are the ideal tools to meet the complex requirements of sample preparation of food. The model GM 200 has proven itself for the homogenization of smaller sample volumes of up to 700 ml. For larger volumes RETSCH now offers the new GRINDOMIX GM 300 with a grinding chamber volume of 5,000 ml.
Powerful Cutting Mill
The SM 300 excels especially in the tough jobs where other cutting mills fail. It has a freely selectable speed range from 700 to 3,000 rpm with high torque. The mill is convenient to operate and easy to clean. Reliable and extremely efficient sample preparation in the laboratory is now guaranteed with the SM 300.
Reliable sample preparation in food technology
An efficient sample preparation procedure for rapid, reliable and reproducible analytical results is becoming increasingly important today. Ever more stringent requirements are being set both in research and production, e.g. for product monitoring and quality control.
Representative results require adequate sample preparation
The following situation is typical for many production plants: After a routine quality check, the production process is stopped or an already produced batch is suspended, because the analysis results were not within the relevant critical values. But does the tested product really deviate from the specifications? The quality control managers are convinced of this because modern analysis instruments provide results with very low tolerances. The sample in question was tested several times and the result was confirmed. The question is why the product does not match the specifications although the production parameters have not been changed in any way.
The possibility that the tested product is indeed deficient cannot be excluded. However, it is often not the product itself which causes irregular analysis results but a lack of understanding of the steps which come before the analysis.
Sample Preparation of Feeds and Forage for NIR Analysis
Near Infrared Spectroscopy is the most important analytical method for the determination of protein content, moisture, fat and ash in feeds and forage. The advantage over classical methods such as Kjeldahl is the simultaneous determination of several parameters. Moreover, NIR spectroscopy is a quick method which requires neither consumables nor reagents. Therefore it is used whenever high sample throughput and great flexibility are required. The identification and qualification of raw materials as well as the quantitative analysis of convenience products can be carried out within seconds to guarantee highest product quality and safety.
A much discussed issue related to NIR analysis is the necessity of sample preparation. Users often face the problem of having to decide whether sample preparation is required or not.
Sieving of agglomerating powders with the air jet sieving machine AS 200 jet
Air jet sieving is usually the method of choice for dry sieving of materials with particle sizes below 40 microns. However, it is also a faster alternative to vibratory sieving of materials of up to 250 microns.
Size reduction within the context of sample preparation
In general “size reduction” is taken to mean the disintegration of solid substances by mechanical forces without altering their state.
Using the CryoMill for samples with volatile substances
For the size reduction of many materials it is more suitable to use a cryogenic mill than a laboratory mill which operates at room temperature. The sample is embrittled by liquid nitrogen which improves its breaking behavior when submitted to impact, pressure and friction; moreover, volatile components of the sample are preserved. The RETSCH CryoMill is not only the most modern and safest cryogenic mill in the market, it also provides excellent grinding results.
Effektive Zerkleinerung mit Schlagrotormühlen
Die reproduzierbare und kontaminationsneutrale Probenaufbereitung spielt eine entscheidende Rolle im Hinblick auf zuverlässige Analysenergebnisse. Ein wichtiger Schritt ist die Homogenisierung und Zerkleinerung der Probe auf eine definierte Feinheit mit Hilfe von Labormühlen. Neben der Zerkleinerung auf Analysenfeinheit können die Schlagrotormühlen von Retsch auch für die Kleinproduktion, Herstellung von Musterchargen und in der Forschung und Entwicklung von neuen Produkten eingesetzt werden.
Fettbestimmung in Lebens- und Futtermitteln
Methoden und Vorgehen
Höchstleistung im Doppelpack
Mit der PM 100 und der PM 200 präsentiert Retsch eine neue Generation von Planeten-Kugelmühlen mit einer bzw. zwei Mahlstellen, die in diesem Produktsegment neue Leistungsstandards setzen.
Komplexe Proben homogenisieren
Messermühlen zur professionellen Probenvorbereitung im Labor

Nahrungsmittel treten in sehr unterschiedlichen Formen und Konsistenzen auf und sind i. d. R. inhomogen. Für die Analytik werden jedoch homogene und repräsentative Proben benötigt, um aussagekräftige Ergebnisse zu erzielen. Im Rahmen der Probenvorbereitung müssen die oft sehr komplexen Proben also homogenisiert und auf eine hinreichende Partikelgröße zerkleinert werden. Dabei können die Materialien sehr stark in Bezug auf Härte und Feuchte variieren. Um den vielschichtigen Anforderungen der Probenvorbereitung von Lebensmitteln gerecht zu werden, bietet sich der Einsatz von Messermühlen an.
Perfekte Homogenisierung von Lebensmittelproben
Nahrungsmittel treten in sehr unterschiedlichen Formen und Konsistenzen auf und sind in der Regel inhomogen. Für die Analytik werden jedoch homogene und repräsentative Proben benötigt, um aussagekräftige Ergebnisse zu erzielen. Für diese Aufgabe sind die Messermühlen Grindomix GM 200 und GM 300 von RETSCH die idealen Instrumente.
Schnell und schonend zerkleinern
In zahlreichen Labors werden täglich viele unterschiedliche Probenmaterialien aufbereitet. Für die Zerkleinerung von Feststoffproben auf Analysenfeinheit wird eine Mühle benötigt, die nicht nur vielseitig einsetzbar und leicht zu reinigen ist, sondern die auch eine reproduzierbare Probenvorbereitung – und damit zuverlässige Analysenergebnisse - garantiert.
Mit der Ultra-Zentrifugalmühle ZM 200 bietet RETSCH eine Rotormühle an, die nicht nur sehr schnell, sondern auch äußerst materialschonend zerkleinert und, dank einer umfangreichen Zubehörpalette, universell einsetzbar ist. Mit ihrem kraftvollen Powerdrive-Antrieb vermahlt die ZM 200 weiche bis mittelharte und faserige Materialien extrem schnell auf Endfeinheiten bis unter 100 µm und steigert so den Probendurchsatz im Labor.
Vermahlungen ohne Verlust von Inhaltsstoffen
Kryomühle im Einsatz an der BTU Cottbus
Bei vielen Materialien ist es vorteilhaft eine Kryomühle für die Zerkleinerung einzusetzen, statt einer Labormühle, die bei Raumtemperatur arbeitet. Die Probe wird durch den eingesetzten flüssigen Stickstoff versprödet und kann darum besser durch Schlag, Druck und Reibung zerkleinert werden; außerdem bleiben leicht flüchtige Bestandteile erhalten. An der Brandenburgischen Technischen Universität (BTU) Cottbus ist eine Kryomühle in den Bereichen Kunststoffrecycling und Biomaterialien im Einsatz.
Molienda ultrarrápida y ultrafina
El nuevo molino ultracentrífugo ZM 200 de RETSCH es un molino de rotor no sólo extremadamente rápido y cuidadoso con el material molido, sino también de uso universal gracias a su amplia gama de accesorios.

新闻发布 (2)

  • Neue Zyklonmühle für die Probenvorbereitung zur NIR Analytik

    RETSCH hat die Zyklonmühle TWISTER speziell für die Probenvorbereitung von Lebens- und Futtermitteln entwickelt, die anschließend mittels NIR analysiert werden. Die optimierte Form des Rotors und des Mahlraums erzeugt einen Luftstrom, der das zerkleinerte Mahlgut durch den integrierten Zyklon in das Probengefäß überführt. Der Luftstrom verhindert gleichzeitig ein Erhitzen der Probe, so dass Feuchtigkeitsverluste vermieden werden. Die im Lieferumfang enthaltenen Siebe garantieren eine optimale Partikelgrößenverteilung, was eine Neukalibrierung des NIR-Spektrometers überflüssig macht. Die Rotorgeschwindigkeit ist in 3 Stufen einstellbar und lässt sich somit an die Anforderungen der Probe anpassen. Der Reinigungsaufwand ist beim TWISTER sehr gering, da die Probe praktisch vollständig aus dem Mahlraum ausgetragen wird. Diese neue Zyklonmühle in bewährter RETSCH-Qualität optimiert die reproduzierbare Probenvorbereitung für die NIR Analytik und ermöglicht somit aussagekräftige Analysenergebnisse.

  • Versatile Ultra Centrifugal Mill with New Cyclone

    RETSCH’s powerful and versatile ZM 200 offers the ultimate in performance and operating comfort. It is used for the rapid size reduction of soft to medium-hard and fibrous materials down to 40 microns. Because of the efficient size reduction technique and the comprehensive range of accessories the ZM 200 ensures the gentle preparation of analytical samples in a very short time.
    For applications which require an optimum air throughput (e. g. heat sensitive materials) or if larger sample volumes need to be processed, the use of a cyclone is recommended. RETSCH offers a re-designed cyclone with improved functionalities for collector volumes from 250 ml to 5 liters which adds to the ZM 200’s great flexibility.
    Thanks to the wide range of accessories with different rotors, ring sieves and collectors, the ZM 200 can be easily adapted to suit a wide range of applications such as, for example, heavy-metal-free grinding, size reduction of abrasive materials or processing small volumes up to 20 ml.

测试报告 (104)