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ma tter

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Desc riptors : s a ps, c emical a na lyis, d termina tio of c onte t, inolub le m ter, impuritie , ethanol

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IS0 (h Internatio al Organizatio fo r Standardizatio ) is a worldwid fe eratio of

b od intere te in a sb je t fo r whic a teh ical c m ite ha s be n s t up ha s th

rig t to be repre e te o that c m ite Internatio al organizatio s, g v ernme ta l

and n n-g v ernme tal, in laisn with ISO , a ls take p art in th work

th member b odie for app rov al b efore th ir a cc p ta nc a s Internatio al Standard by

th IS0 C ou ci

Sura ce activ e age ts

Eg pt, A ra R ep of

Pola nd

Roma nia

So th Afica, R ep of

Spa in

Switz rland

Yug sla v ia

No member bo y ha d e pre s d disap prov al of th d c me t

me t 1, whic was circ late dire tly to IS0 C ou ci for a cc pta nc in a cc rda nc

with claus 5.10.1 of p art 1 of th Dire tiv es for th te h ical work of ISO

0 Interna tiona l Orga niza tion fo r Sta nda rdiza tion, 191 0

Printed in S itzerla nd

Soaps - Determina tion of content of etha nol-insoluble

ma tter

mina tio of th c nte t of ethanol-inolub le m ter in c m er

2 Definition

F or th purpo e of this Internatio al Standard, th folowin

d finitio a p ple

pro e ure spe ifie in this Internatio al Standard

NOT S

1 The etha nol-inoluble m ter corespn to the a dditiv es an

foreig m ter, of low solub ilty or in oluble in 9 % (V/ V I etha nol, a d-

ded to soa ps, an a lso to sbsta nc es in a ll sop formula tion, sc h a s

a lka li ca rbna tes an c hlorides, of low solubi ty in 9 % (V /V)

etha nol

2 The foreig m ter may b inorga nic (c a rbna tes, bra tes, p er

bra tes, c hlorides, slpha tes, sic ates, phospha tes, iron oxides, etc )

or orga nic (sta r c hes, dex trin, ca sein , s ars, c elulose deriva tiv es,

a lgina tes, etc )

3 Princ iple

th u dis olv ed re id e

Ordina ry labora tory a pp a ra tu a nd

5.1 Co ica l fla sks, of ca pa city 5 0 ml ha v in gro n gla ss

n cks

5.2 R eflu co d nser, w erc oole , with a c nica l gro n

glas joint at th botom to fit th c nica l fla sks (5.1)

5.3 Water ba th

5.4 O ve , ca pa ble of bein c ontole at 10 I? 2 O C

5.5 Ana lytica l b la nce, a cc ra te to 0,0 1 g

Pro e ure for th p reparatio a nd stora ge of th la b oratory

sample wi form th s bje t of a future Internatio al Standard

Weig , to th n are t 0,Ol g, a b out 5 g of th lab oratory sam-

ple into a c nica l flask (5.1)

7.2 Determina tio

Add 2 0 ml of th ethanol (4 1) to th te t p orio (7.1) in th

c onica l fla sk a nd c n e t th reflu c n e s r (5.2)

Hea t to g ntle b oin , swirln in ord r to av oid, as far as po si-

b le, m eria l a dh rin to th botom of th flask

Dry th fiter paper to be u e for th fitatio of th in olub le

m ter in th ov en (5.41, c ontole at 10 IL 2 O C, for 1 h

Alow it to c ol to ambie t tempera ture in a d sic a tor a nd

weig it to th n a re t 0,0 1 g Plac it in a fu n l mo nte o

a s c n c nica l fla sk (5.1)

th s p erna ta nt lq id o to th fiter p ap er, was th in oluble

(4 1 , prev io sly h ate to n a r its b oi n p oint, a nd tansfer

th in oluble m ter to th fite r paper with th a id of smal

q antitie of warm ethanol (4.1)

u ti e tirely fe fom s a p 1

Durin this op eratio , it is a dv a nta ge u to pla ce th c nica l

fla sk ca rryin th fu n l o th w er b ath (5.3) s ‘as to k ep

th fitr ate g ntly b oi n A n in ep en e tly h a te fu n l may

a ls be u e

I The fina l wa shin s sould s ow no a pprecia ble reside on ev a pora tion

At th same time, c v er th fu n l with a watc glass By this

fiter p a per in air a nd th n pla ce it in th ov en (5.41, c ntole

at 10 f 2 O C Afer 1 h, remo e th fiter p ap er, lea v e it in th

d sica tor ju t lo g e o g for it to c ol c mpletely to a mbie t

temp era ture a nd weig it R epeat th operatio s of dryin in

we n two s c e siv e weig in s is le s than 0,0 1 g Note th

final mas

NOT - With c erta in soa ps, espcia lly si c a ted soa ps, the in oluble

m ter ca nnot b completely deta ched from the btom of the conic a l

flask In this c a se, after thorou hly wasin the resid e with etha nol,

disolv e it in a ltle hot distied wa ter Tra nsfer this solution to a

weig ed ev a pora tin dis, ev a pora te on the bi n wa ter ba th an dry

in the ov en (5.4 ), c ontroled a t 10 + 2 “C A llow to col in a desic

c ator an weig Reet the oera tion of dryin (for priod of 1 h)

c ooln an weig in u ti the diferene in ma ss btween two sc -

c esiv e weig in s is les tha n 0,01 g A dd this mas to tha t of the

reside on the fiter pa per

8.1 C a lc ula tion

perc nta ge by mas , is giv en by th formula

m

m0

wh re

mc

is th mas , in grams, of th tet p orio ;

m is th mas , in grams, of th re id e

8.2 R eprod c ibi ty

p le in two difere t la b oratorie s all n t e c e 0,0 % for

c nte ts of etha nol-in oluble m ter le s tha n or e ua l to 1 %,

a nd s a ll n t e c e 0, % for c nte ts of etha nol-in oluble

m ter hig er than 1 %

T he te t rep or s a ll in lu e th folowin p a rticlars :

a ) all inform io n c s ary for th c mplete id ntific atio

of th sample;

Internatio al Standa rd);

e pre s d;

d) th te t c n itio s;

Sta nda rd, or re ard d as op tio al, as wel as an in id nts

lkely to ha v e affec te th re ults