Feed factory quality control should pay attention to! The detection methods of crude protein, calcium and phosphorus should be updated in time!

OA show ('918 '); Determination of crude protein in feed GB / T 6432-2018 was released on September 17, 2018, and implemented on April 1, 2019, replacing the determination of crude protein in feed GB / T 6432-94; MTX GB / t6436-2018 was issued on May 14, 2018, implemented on December 1, 2018, replacing GB / T 6436-2002, and MTX GB / T 6437-2018 was issued on September 17, 2018, implemented on April 1, 2019, replacing GB / T 6437-2002; MTX 2018, the update of these three test methods and standards, according to the last modification, is as early as 16 years ago, and the test method of crude protein is 24 years laterAs colleagues of feed test, they must update their own standards in timeLet's see that the three standards have been updated in some aspects! MTX 1, determination of crude protein in feed The MTX of Kjeldahl method GB / T 6432-2018 is mainly to regulate the effective figures of the results, which are kept to two places after the decimal point MTX 2The MTX of GB / t6436-2018 for the determination of calcium in feedstuff is the change of the sample weight from 2-5g to 0.5-5g; the MTX 2 is to increase the limit of quantification by 0.05%; the MTX 3 is to change the sieved hole from 0.42mm to 0.45mmMTX MTX 3Spectrophotometric determination of total phosphorus in feed (GB / T 6437-2018)MTX 1Increased detection limit of 20mg / kg, quantitative limit of 60mg / kg; MTX 2Storage period of phosphorus standard stock solution for one month; MTX 3The range of standard curve changed from 0-16ug / ml to 0-15ug / ml; MTX 4 is to delete the content of "not applicable to the feed containing dicalcium phosphate [Ca (H2PO4) 2] in the dry ashing method"MTX MTX accessories: MTX MTX crude protein gbt6432-2018.pdf 9bdf136189f84b8467eda0495b1a0319.pdf (398.63 KB) MTX MTX calcium gbt6436-2018.pdf e55e300877e44a9a081b96f534c9.pdf (2.62 MB) MTX phosphorus Gbt6437-2018.pdf a2943329e55ff2727b30834ba8a4ca8.pdf (341.12 KB) (author: Ruonan)