INTERNATIONAL STANDARD INTERNATIONAL ORGANKATION FOR STANDARDIZATIOM ORGANISATION INTERNATIONALE DE NORMALISATION lvlEX)JYHAPO~HAR OPTAHM3A~Mfl l l0 CTAHflAPTL1 3A~MM Tea Determination of total ash TM[.]
I SO I N TERN ATI ON AL STAN DARD 575 Thi rd edi ti on 987-1 0-01 I N TERN ATI ON AL ORG AN KATI ON ORG AN I SATI ON I N TERN ATI ON ALE l vl EX) J YH APO~ H AR Tea TM - - Determ i n ati on Determ i n ati on d es cen dres of total OPTAH M 3A~ M fl FOR STAN DARDI ZATI OM DE l -l N ORM ALI SATI ON CTAH fl APTL1 3A~ M M ash total es Referen ce n u m ber I SO 575: 987 (E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental’and non-governmental, in liaison with ISO, also take part in the work Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting International Standard ISO 575 was prepared by Technical Committee ISO/TC 34, Agricultural food produc ts This third edition cancels and replaces the second edition (ISO 575 : 9801 , of which it constitutes a minor revision Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated International Organkation for Standardkation, Printed in Switzerland 987 I N TERN ATI ON AL Tea and fi eld I n tern ati on al n ati on I SO Determ i n ati on - Scope Th i s STAN DARD of Stan dard of th e total total appli cati on speci fi es ash from of a m eth od for th e determ i - ash H ot-pl ate 5 Desi ccator, An al yti cal m atter Preparati on Tea - of g rou n d Sam pl e of kn own 576, Tea Determ i n ati on - of water-sol u bl e asb Determ i n ati on Tea - of aci d-i n sol u bl e total + Preparati on of H eat th e di sh (5 ) for of th i s I n tern ati on al Stan dard , th e fol l owi n g 0, 001 g : Th e 25 OC u n der resi du e th e obtai n ed di ti on s after i n ci n erati on Test th e di sh h i n th e fu rn ace (5 5) After cool i n g , (5 2) at 525 wei g h + 25 OC to th e n earest speci fi ed in th i s Porti on at I n ter- Wei g h , i n to Stan d ard to th e n earest 0, 001 th e prepared di sh g , abou t (7 ) g of th e g rou n d Sam pl e (See I SO 572 ) Determ i n ati on Pri nci ple Destru cti on stan t of org an i c m atter by h eati n g at 525 + 25 OC to m ass H eat th e test 00 OC u n ti l fu rn ace free th e l aboratory apparatu s, an d th e fol l owi n g i tem s Repeat Di sh , l n or oth er N OTE - of capaci ty m ateri al I t i s si dered 50 to 00 m l, m ade of pl ati n u m , u n affected that by th e di ti on s si l i ca di sh es are u n su i table Fu rn ace, Steam bath th ese two rt (at m oi sten fu rn ace for i n th e h th e ash wi th 60 m i n , if cool for th e ash i s vi si bl y i s u su al l y di sti l l ed n ecessary, wei g h i n g s i n th e 30 m i n , does n ear th e di sh to th e req u i red ) water, on th e h ot-pl ate fu rn ace operati on s, su ccessi ve 25 OC u n ti l l east (5 3) an d th en at a tem peratu re Tran sfer (5 4) dry i t Retu rn desi ccator cool u n ti l an d an d wei g h th e n ot exceed d i fferen te 0, 001 g porce- of th e test for u se wi th Reserve th e total asb an d water-i n sol u bl e ash for determ i n ati on of water-sol u bl e ash (see I SO 576) , or of aci d-i n sol u bl e ash (see I SO 5771 , i f req u i red th i s test parti cl es H eat ag n between i n th e di sh , i s expel l ed h eat at 525 th en di sh to th e wei g h : an d to cool , Porti on m oi stu re carbon on th e steam Apparatu s U su al th e (5 2) from Al l ow prepared as appl i es ash n ati on al ten t, Procedu re Cool i n th e d esi ccator pu rposes defi n i ti on d ry m atter ash Defi ni ti on For th e Sam pl e of kn own i n I SO 572 an d bal an ce ash I SO 577, desi ccan t Sam ple U se a g rou n d ten t wa ter-i n sol u bl e 525 an eff i ci en t d ry speci fi ed tai n i n g tea References I SO 572, I SO 575 : 987 (E) capabl e of bei n g trol l ed at 525 + 25 OC Carry bath N u m ber ou t two Sam pl e (cl au se of determ i n ati on s separate determ i n ati on s on th e sam e g rou n d 6) I SO 575 : 987 Expressi on (El of Take resu l ts as th e ti on s, resu l t provi ded th e ari th m eti c m ean th at th e requ i rem en t of th e two for repeatabi l i ty determ i n a(see 2) i s sati sf i ed M ethod of cal cu lati on and form u la Th e total cen tag e ash yi el ded by th e g rou n d by m ass on th e dry basi s, Sam pl e, expressed i s g i ven by th e form u l a Th e d i fferen te ri ed rn l x 00 - x m i s th e m ass, i n g ram s, i n g ram s, RS i s th e d ry m atter th e g rou n d of th e test Porti on ; Th e of th e total ten t, as a percen tag e determ i n ed Sam pl e, ash ; in by m ass, accord an ce 663 95 Descri ptors Test test in of two rapi d determ i n ati on s, su ccessi on by th e carsam e ash per 00 g of g rou n d report report : 543 822 : ag ri cu l tu ral produ cts, tea, tests, sh al l sh ow th e lt sh al l al so m en ti on fi ed i n th i s wel l as an y ci rcu m stan ces I n tern ati on al Th e report sh al l i n cl u de cati on Pri ce based on pages or Stan dard, th at m eth od u sed an y operati n g an d detai l s or reg ard ed th e resu l t n ot speci - as opti on al , m ay h ave i n fl u en ced as th e resu l t of wi th I SO 572 U DC th e resu l ts sh al l n ot exceed 0, g of total obtai n ed ml between si m u l tan eou sl y Sam pl e RS i s th e m ass, ou t an al yst, 00 - wh ere m Repeatabi l i ty as a per- ash determ i nation of th e Sam pl e al l detai l s requ i red for com pl ete i den ti fi -