Tiêu chuẩn iso 01577 1987 scan

INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEX, lJYHAPOAHAFi OPTAHM3A~MR l l0 CTAHAAPTM3AuMM Tea Determination of acid insoluble[.]

INTERNATIONAL STANDARD

INT ER A T IONA L ORGA NIZA T ION FOR STA NDA RDIZA T ION

ORGA NISA TION INT ER AT I NA LE DE NORMA LISA TION

MEX,lJY HA OA AFi OPTA M3A~MR l-l0 CTA A PTM3AuM

T ea -

T hh - Dh r mina tio d s c n r es in oluble da ns lacid

Secon edition

19 7-10-01

Ref er en e n m ber

ISO 157 : 19 7 (E)

ISO (h Intern tio al Org nizatio for Sta d rdizatio ) is a worldwid fe eratio of

n tio al Sta d rds b dies (ISO memb r b dies) Th work of pre arin Intern tio al

Sta d rds is n rmaly carie out throug ISO tech ical commite s Es h memb r

b dy intereste in a s bject for which a tech ical com ite h s b e esta lsh d h s

th rig t to b re rese te o th t com ite Intern tio al org nizatio s, g v rn-

me tal a d n n-g v rnme tal in laiso with ISO, also tak e p t in th work

Draf Intern tio al Sta d rds a o te by th tech ical com ite s are circ late to

th memb r b dies for a pro al b fore th ir ac e ta ce as Intern tio al Sta d rds by

th ISO Counci Th y are a pro e in ac ord nce with ISO proce ures re uirin at

le st 7 % a pro al by th memb r b dies v tin

Intern tio al Sta d rd ISO 15 7 was pre are by Tech ical Com ite ISO/TC 3 ,

A gric ltural f oo pr od cts

This seco d e itio ca cels a d re laces th first e itio (ISO 15 7 : 19 01, clau e 6 of

which h s b e th s bject of a min r re isio

Users sh uld n te th t al Intern tio al Sta d rds un erg re isio fr om time to time

a d th t a y refere ce ma e h rein to a y oth r Intern tio al Sta d rd imples its

latest e itio , unles oth rwise state

0 Internatio al Or ganizatio for Stan ar dizatio , 19 7

Tea -

T his Intern tio al Sta d rd sp cifies a meth d for th d ter-

min tio of th acid-insoluble ash from te

2 Ref er en es

ISO 15 2, T ea - Repratio of grou d Sample of k ow n dry

mater c nte t

ISO 15 5, T ea - Deter minatio of total asb

3 Def i ition

For th purp ses of this Intern tio al Sta d rd, th folowin

d finitio a ples

acid-insoluble ash : Th p rt of th total ash, o tain d in ac-

cord nte with ISO 15 5, remainin afer tre tme t with

hydrochloric acid Solutio un er th co ditio s sp cifie in this

Intern tio al Sta d rd

4 Pr i ciple

Tre tme t of th total ash with hydrochloric acid Solutio ,

fitratio , ig itio a d weig in of th residue

A ll re g nts sh l b of reco nize a alytical gra e Th water

u e sh l b disti e water or water of e uiv le t purity

5.1 Hydrochlorit acid solutio

Diute 1 v lume of co ce trate hydrochloric acid (~ 0 1,16 to

1,18 g/ml) with 2,5 v olumes of water

W ARNING

rosiv , h s a irita t v p ur a d Cau es burns

6 A pp r atu

Us al la oratory a p ratu , a d th folowin items :

6.1 Dish, of ca acity 5 to 10 ml ma e of platinum,

p rcelain or oth r material un fecte by th co ditio s of th

test, u e for th d termin tio of total ash

NOT -

lt is c n id re that sica dis e ar e u s ita le f or u e w ith

this te t

6.2 Furn ce, ca a le of b in co trole at 5 5 + 2 O

6.4 Fiter Pa er, ashles

6.5 Desic ator, co tainin a eficie t d sic a t

6.6 An lytical b la ce-

7 Pr oced r e

Se ISO 15 5

7.2 Determin tio

To th total ash o tain d as d s rib d in ISO 15 5, co tain d in

th dish (6.1 , a d 2 ml of th hydrochloric acid Solutio (5.1)

Co er th dish with a watch glas to pre e t sp terin , a d

b i g ntly th Solutio for 10 min Alow to co l a d fiter th

co te ts of th dish throug th fiter Pa er (6.4) Wash th

dish a d th fiter Pa er with h t water unti th washin s are

fre from th acid, as co firme by th siv r nitrate Solutio

(5.2) Return th fiter Pa er a d co te ts to th dish,

e a orate th water carefuly o th b in water b th (6.3)

a d h at in th furn ce (6.21, co trole at 5 5 k 2 O , unti

th residue is fre from visible carb n p rticles Co l th dish in

th d sic ator (6.5) a d weig He t a ain in th furn ce’for

3 min, alow to co l a d weig ; re e t th se o eratio s, if

n ces ary,

7.3 Numb r of d termin tio s

Cary out two se arate d termin tio s o th residues o tain d

from th two d termin tio s of total ash

8 Expr es ion of r es lts

RS is th dry mater co te t, as a p rce ta e by mas , of

th groun Sample, d termin d by th meth d sp cifie in

ISO 15 2

Take as th res lt th arithmetic me n of th two d termin -

tio s, pro id d th t th re uireme t for re e ta i ty (se 8.2) is

satisf ie

8.2 Re e ta i ty

Th acid-insoluble ash o tain d from th groun Sample, ex-

pres e as a p rce ta e by mas o th dry b sis, is e ual to

m3 x - x -

wh re

mo, is th mas , in grams, of th test Portio of th groun

ISO 15 5);

m3 is th mas , in grams, of th acid-insoluble ash;

Th difere te b twe n th res lts of two d termin tio s,

carie out simulta e u ly or in ra id s c es io by th same

a aly t, sh l n t ex e d 0,0 g of acid-insoluble ash p r 10 g

of groun Sample

9 T est r ep r t

Th test re ort sh l sh w th meth d u e a d th res lt o -

tain d It sh l also me tio a y o eratin d tais n t sp cifie

in this Intern tio al Sta d rd, or re ard d as o tio al as wel

as a y circ msta ces th t may h v influe ce th res lt

Th re ort sh l includ al d tais re uire for complete id n-

tificatio of th Sample

De criptor s : ag c ltural pr od cts,

t e te ts, as d terminatio

Pric ba se o 2 pa ge