It specifies the reference procedures and, in certain cases, an alternative method which can be considered as giving equivalent results. If other methods are used it is necessary to show that they give results equivalentto those given by the reference methods. In cases of dispute, only the referenceprocedures shall be used. Unless otherwise stated, the test methods specified inthis European Standard may be used for factory production control, for audit tests or for type tests.
Im Streitfall sollten die Referenzverfahren angewendet werden. This document gives a brief overview of each of the dynamic techniques which are described in detail in the subsequent parts of ISO This document provides basic information to support an informed choice for one or another method for the preparation of calibration gas mixtures. It also describes how these methods can be linked to national measurement standards to establish metrological traceability for the composition of the prepared gas mixtures.
Since all techniques are dynamic and rely This method has been successfully validated by collaborative trial in the following matrices: rye, barley, wheat, complete feed for bovine, porcine and poultry. Validation in buckwheat produced acceptable results, but the relative standard reproducibil For the validation of multi-analyte methods their particularities must be considered which might necessitate deviations from the prescribed validation protocols.
This study provides information whether the method is fit for its purp This document specifies a method for the determination of benzoic acid and sorbic acid in animal feeding stuffs by high-performance liquid chromatography method with ultraviolet detection HPLC-UV. The method is intended to be used for the determination of benzoic acid and sorbic acid as active substances in feed additives, premixtures, feed materials and compound feed and for benzoic acid in water.
This method determines the total extractable concentration of these organic acids and their sal Transfer the filter paper to the beaker and redissolve it in 5 ml concentrated hydrochloric acid to which has been added 70 ml hot water. Acidify the combined filtrates will froth on addition of the acid. In these cases, add the acid slowly while continuously stirring.
Aggregates containing sulfide and washings which should be about ml in all will release H2S on acidification and this will be noticeable by its with 1 ml concentrated hydrochloric acid, bring to the smell. In these cases there is a danger that this procedure will boil and boil for 5 min. While stirring vigorously, the overestimate the sulfate content because of sulfide oxidation.
To avoid any oxidation, place 90 ml water and 10 ml of concentrated solution maintained at boiling point, add drop by hydrochloric acid in a ml beaker and heat to boiling point. Mature, filter and ignite the barium sulfate precipitate Filter the residue through a medium filter paper into as specified in Wash thoroughly with hot water. Check the washings for the absence of chloride ions Weigh to the nearest 0,1 mg and calculate the mass of by the silver nitrate test 6.
Adjust the volume to about ml. If necessary, acidify Calculate the total sulfur content of the aggregate, expressed as S, from the following equation: Bring to the boil and boil for 5 min. While stirring vigorously the solution where maintained at boiling point, add drop by drop 10 ml of the barium chloride solution 4. Mature, filter and ignite the barium sulfate precipitate as specified in NOTE A statement on the precision of the determination of total Weigh to the nearest 0,1 mg and calculate the mass of sulfur content is given in annex A.
The sulfate ion content is expressed as a m6 is the mass of the test portion in grams. NOTE A statement on the precision of the determination of the The laboratory sample shall be taken in accordance with the procedures specified in EN The test portion is decomposed by hydrochloric acid under reducing conditions. The sulfides are converted The precipitated zinc sulfide is determined by mass specified in Table 1 appropriate to the nominal iodometry.
Stepwise crush and reduce the Then proceed to grinding and further The laboratory sample shall be taken in accordance reduction until a mass of approximately 20 g passing with the procedures specified in EN Take Ensure that the laboratory sample is representative of approximately 2 g of this material as the test portion. If drying is necessary during the procedure, the Stepwise crush and reduce the Weigh the test portion to the nearest 0,1 mg m6 ; place sub-sample.
Then proceed to grinding and further in a ml beaker, add 90 ml of cold water. While reduction until a mass of approximately 20 g passing stirring the mixture vigorously, add 10 ml of the 0, mm test sieve is obtained. Take concentrated hydrochloric acid. Heat the solution approximately 1 g of this material as the test portion. This clause specifies methods for detection of iron Add about 2,5 g of tin II chloride 4. These stains may be impossible to remove FeS2 that happen to be present in the aggregate.
Disperse the mixture in 50 ml of water. Fix to the flask the ground neck supporting the separating funnel and The stockpile shall be inspected, and Connect the outlet of the condenser to the glass tube approximately 50 particles, representative of those which dips into the beaker containing 15 ml of suspected to contain iron sulfide, shall be taken for ammoniacal zinc sulfate solution 4.
Connect the gas supply nitrogen or argon and adjust the flow to about 10 ml per min. Stop the flow Reconnect the gas supply, heat the contents of should form within 5 min. This precipitate changes rapidly to the flask to boiling and boil for 10 min.
Disconnect the brown ferric hydroxide on exposure to air and light. This reaction should be complete within 30 min and indicates the presence of outlet tube which will serve as a stirrer during the rapidly reacting iron sulfide. If no brown gelatinous precipitate is formed when the NOTE 3 Some aggregates of higher sulfide content may require more than 10 min reaction time for complete transformation of all particles are placed in saturated limewater they may be sulfides to precipitated zinc sulfide.
Check that the extraction is slowly reacting particles. If the presence of slowly complete by bubbling the outlet into fresh ammoniacal zinc sulfate reacting particles is suspected the following procedure solution. If no precipitate appears, the extraction is complete. Titrate with concrete. The method estimates substances such as lignite and F is the factor of the potassium iodate solution coal which may cause staining or pop-outs on concrete as specified in 4.
If necessary, the method can be V10 is the volume of sodium thiosulfate solution adapted for use on coarse aggregates by examining used for the titration in millilitres; larger test portions see Table 1. By immersing a suitable test NOTE This flotation process is inapplicable to lightweight aggregates and the determination of lightweight contaminators in The content of humus is estimated from the colour lightweight aggregates should be carried out by hand-picking.
The intensity of the colour laboratory sample shall be 5 kg; this shall be reduced depends on the humus content. A strong colour reaction will usually derive Spread the test portion over the tray 5. Therefore, in this case the method does not allow any definitive Record the mass of the dried sand m9 to the conclusion.
Separate the aggregate on the mm The laboratory sample shall be taken in accordance Pour about 1 l of the solution of zinc chloride 4. Gently the moisture content as well as the solids. Gently agitate the floating oven 5. Sieve particles with the glass rod to dislodge air bubbles the sample on the 4 mm sieve 5. Crush the fraction particles to sink to the aggregate bed.
Return the solution to 5. Then pour the test portion until the height of aggregate and solution the first beaker and agitate the bed of aggregate again. In cases of dispute, only the referenceprocedures shall be used. Unless otherwise stated, the test methods specified inthis European Standard may be used for factory production control, for audit tests or for type tests.
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Method for determination of water-soluble chloride salts Withdrawn. Methods for determination of sulphate content Withdrawn. Method for determination of acid-soluble material in fine aggregate Superseded but remains current. Superseded by BS EN Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.
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