INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEX, lJYHAPOAHAFi OPTAHM3A~MR l l0 CTAHAAPTM3AuMM Tea Determination of acid insoluble[.]
I SO I N TERN ATI ON AL STAN DARD 577 Second edi ti on 987-1 0-01 I N TERN ATI ON AL ORG AN I ZATI ON ORG AN I SATI ON I N TERN ATI ON ALE M EX, l J YH APOAH AFi Determ i nati on Tea - Thh Dherm i na - ti on des cendres of OPTAH M 3A~ M R aci d-i n sol u bl e i n sol u bl es dans FOR STAN DARDI ZATI ON DE l -l N ORM ALI SATI ON CTAH AAPTM 3Au M M ash l ’aci de Reference nu m ber I SO 577 : 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 patt 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 577 was prepared by Technical Committee ISO/TC 34, Agricultural food products This second edition cancels and replaces the first edition (ISO 577 : 9801 , clause of which has been the subject of 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 Organization for Standardization, Printed in Switzerland 987 I N TERN ATI ON AL Tea Determ i n ati on - Scope Th i s and fi el d I n tern ati on al m i n ati on I SO STAN DARD of Stan dard of aci d-i n sol u bl e appl i cati on speci fi es of th e aci d-i n sol u bl e a m eth od ash from for th e d eter- ash Apparatu s U su al l aboratory Di sh , Referen ces I SO 572, m atter Tea Reparation For th e Tea ground Determ in ation - pu rposes of th i s of Sam pl e total I n tern ati on al ash of known dry asb Stan d ard, wi th : Th e part of th e total I SO 575, h ydroch l ori c aci d Sol u ti on I n tern ati on al Stan dard th e fol l owi n g rem n i n g ash , after obtai n ed of capaci ty or oth er u sed for to 00 m l, u n affected th e determ i n ati on l t i s si dered N OTE - 50 m ateri al that m ade of pl ati n u m , by th e di ti on s of total of th e ash si l i ca di sh es are u n su i table for u se wi th Fu rn ace, capabl e Boi l i n g Fi l ter Desi ccator, 6 An al yti cal water of bei n g trol l ed at 525 + 25 OC bath Paper, fi l trati on , treatm en t u n d er th e di ti on s wi th speci fi ed th e i gn i ti on total ash wi th an d wei g h i n g h ydroch l ori c of th e aci d Sol u ti on , reag en ts Test bal an ce- Porti on See I SO 575 Determ i n ati on To th e total ash obtai n ed sh al l be of recog n i zed be di sti l l ed water an al yti cal or water g rad e Th e water of equ i val en t Cover boi l pu ri ty th e di sh g en tl y wi th , g/m l ) wi th WARN I N G rosi ve, h as an aci d sol u ti on of th e of cen trated 2, vol u m es h yd roch l ori c aci d (~ 20 , to of water Con cen trated i rri tan t free from vapou r an d h ydroch l ori c an d (5 2) Cau ses aci d bu rn s is cor- th e Retu rn evaporate di sh n i trate, approxi m atel y g/l Sol u ti on th e i n I SO 575, tai n ed d esi ccator 30 m i n , al l ow wei g h i n g s g l ass to th rou g h Paper wi th aci d, th e th e fi l ter water (6 5) cool u n ti l th e d oes n ot an d on th e vi si bl e carbon wei g h an d di fferen te exceed 0, 001 u n ti l th e wash i n g s are n i trate ten ts to water at 525 parti cl es k th ese th e Sol u ti on th e di sh , bath (6 3) 25 OC, u n ti l Cool th e di sh i n i n th e between N ote th e th e boi l i n g repeat g an d Wash si l ver H eat ag n wei g h ; spatteri n g , Paper (6 4) (6 21 , trol l ed an d to fi l ter in (5 ) to cool an d fi l ter by th e Paper carefu l l y aci d Sol u ti on preven t Al l ow h ot water as fi rm ed th e resi du e i s free from th e for h eat i n th e fu rn ace n ecessary, Si l ver a watch th e Sol u ti on di sh an d th e fi l ter H ydroch l ori t vol u m e as descri bed th e di sh (6 1 , add 25 ml of th e h yd roch l ori c ten ts Di l u te desi ccan t resi du e Reagen ts u sed sh al l an effi ci en t Procedu re of tai n i n g i n th i s ash l ess i n ac- Pri n ci pl e Treatm en t : appl i es cordan te All i tem s th i s test aci d-i n sol u bl e an d th e fol l owi n g Defi ni ti on defi n i ti on of content I SO 575, test, - apparatu s, tea porcel n 577 : 987 (E) fu rn ace’ for operati on s, two if su ccessi ve l owest m ass I SO 577 : 987 N u m ber (E) of RS determ i n ati on s i s th e dry m atter th e Carry ou t two separate determ i n ati on s from determ i n ati on s th e two of total g rou n d Sam pl e, ten t, as a percen tag e determ i n ed by th e m eth od by m ass, of speci fi ed in I SO 572 on th e resi du es obtai n ed ash Take as th e ti on s, resu l t provi d ed th e ari th m eti c m ean th at th e req u i rem en t of th e two determ i n a- for repeatabi l i ty (see 2) i s sati sf i ed Expressi on of resu lts 8 M eth od of cal cu l ati on an d Th e Th e aci d-i n sol u bl e ash obtai n ed pressed as a percen tag e m3 x 00 - x m() from Repeatabi l i ty form u l a th e by m ass on th e g rou n d Sam pl e, d ry basi s, i s eq u al di fferen te ex- carri ed to an al yst, ou t RS of g rou n d Sam pl e report Test Th e test i s th e m ass, u sed resu l ts of two determ i n ati on s, or i n rapi d su ccessi on sh al l n ot exceed 0, 02 g of aci d-i n sol u bl e tai n ed m o, th e by th e sam e ash per 00 g 00 - wh ere Sam pl e between si m u l tan eou sl y i n g ram s, for th e of th e test Porti on determ i n ati on of of th e g rou n d total ash (see i n th i s report sh al l sh ow I t sh al l al so m en ti on I n tern ati on al as an y ci rcu m stan ces th e Stan dard , th at m eth od u sed an d th e an y operati n g m ay or reg ard ed detai l s resu l t ob- n ot speci fi ed as opti on al , h ave i n fl u en ced th e as wel l resu l t I SO 575) ; Th e m3 U DC i s th e m ass, 663 95 Descri ptors of th e aci d-i n sol u bl e ash ; : 543 822 : ag ri cu l tu ral Pri ce based on pages i n gram s, produ cts, tea, tests, ash determ inati on report ti fi cati on sh al l i n cl u de of th e Sam pl e al l detai l s requ i red for com pl ete i d en -