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preface to fifteenth edition

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11.98 SECTION 11<br />

TABLE 11.36<br />

Masking Agents for Various Elements<br />

Element<br />

Masking agent<br />

Ag Br , citrate, Cl ,CN ,I ,NH 3 ,SCN , SO 2<br />

2 3 , thiourea, thioglycolic acid, diethyldithiocarbamate,<br />

thiosemicarbazide, bis(2-hydroxyethyl)dithiocarbamate<br />

Al Acetate, acetylace<strong>to</strong>ne, <br />

2<br />

BF4, citrate, C2O4<br />

, EDTA, F , formate, 8-hydroxyquinoline-5-sulfonic<br />

acid, manni<strong>to</strong>l, 2,3-mercap<strong>to</strong>propanol, OH , salicylate, sulfosalicylate, tartrate, triethanolamine,<br />

tiron<br />

As Citrate, 2,3-dimercap<strong>to</strong>propanol, NH 2 OH · HCl, OH , 2 2<br />

S2 , S2O3<br />

, tartrate<br />

Au Br ,CN ,NH 3 ,SCN , SO 2<br />

2 3 , thiourea<br />

Ba Citrate, cyclohexanediaminetetraacetic acid, N,N-dihydroxyethylglycine, EDTA, F 2<br />

, SO 4 , tartrate<br />

Be<br />

Acetylace<strong>to</strong>ne, citrate, EDTA, F , sulfosalicylate, tartrate<br />

Bi<br />

Br , citrate, Cl , 2,3-dimercap<strong>to</strong>propanol, dithizone, EDTA, I ,OH ,Na 5 P 3 O 10 ,SCN , tartrate,<br />

thiosulfate, thiourea, triethanolamine<br />

<br />

Ca<br />

BF , citrate, N,N-dihydroxyethylglycine, EDTA, F 4<br />

, polyphosphates, tartrate<br />

Cd Citrate, CN , 2,3-dimercap<strong>to</strong>propanol, dimercap<strong>to</strong>succinic acid, dithizone, EDTA, glycine, I ,<br />

malonate, NH 3 , 1,10-phenanthroline, SCN , SO 2<br />

2 3 , tartrate<br />

Ce Citrate, N,N-dihydroxyethylglycine, EDTA, F 3<br />

, PO 4 , reducing agents (ascorbic acid), tartrate,<br />

tiron<br />

Co<br />

Citrate, CN , diethyldithiocarbamate, 2,3-dimercap<strong>to</strong>propanol, dimethylglyoxime, ethylenediamine,<br />

EDTA, F <br />

, glycine, H 2 O 2 ,NH 3 , NO , 1,10-phenanthroline, Na 5 P 3 O 10 ,SCN 2<br />

,<br />

SO 2 2 3 , tartrate<br />

Cr Acetate, (reduction with) ascorbic acid KI, citrate, N,N-dihydroxyethylglycine, EDTA, F ,<br />

2<br />

formate, NaOH H 2 O 2 , oxidation <strong>to</strong> CrO 4 , Na 5 P 3 O 10 , sulfosalicylate, tartrate, triethylamine,<br />

tiron<br />

Cu<br />

Ascorbic acid KI, citrate, CN , diethyldithiocarbamate, 2,3-dimercap<strong>to</strong>propanol, ethylenediamine,<br />

EDTA, glycine, hexacyanocobalt(III)(3), hydrazine, I ,NaH 2 PO 2 ,<br />

, 1,10-phenanthroline, S 2 ,SCN 2 2<br />

NH2OH · HCl, NH 3, NO2 SO3 , S2O3<br />

, sulfosalicylate,<br />

tartrate, thioglycolic acid, thiosemicarbazide, thiocarbohydrazide, thiourea<br />

Fe Acetylace<strong>to</strong>ne, (reduction with) ascorbic acid, CO 2 , citrate, CN 2 4<br />

, 2,3-dimercap<strong>to</strong>propanol,<br />

EDTA, F ,NH 3 ,NH 2 OH · HCl, OH 3<br />

, oxine, 1,10-phenanthroline, 2,2’-bipyridyl, PO 4 ,<br />

4,S 2 ,SCN 2<br />

PO 2 7 , SnCl 2 , SO 2 3 , sulfamic acid, sulfosalicylate, tartrate, thioglycolic acid,<br />

thiourea, tiron, triethanolamine, trithiocarbonate<br />

Ga<br />

Citrate, Cl , EDTA, OH , oxalate, sulfosalicylate, tartrate<br />

Ge<br />

F , oxalate, tartrate<br />

Hf<br />

See Zr<br />

Hg<br />

Ace<strong>to</strong>ne, (reduction with) ascorbic acid, citrate, Cl ,CN , 2,3-dimercap<strong>to</strong>propan-1-ol, EDTA,<br />

formate, I ,SCN 2<br />

, SO 3 , tartrate, thiosemicarbazide, thiourea, triethanolamine<br />

In<br />

Cl , EDTA, F ,SCN , tartrate, thiourea, triethanolamine<br />

Ir<br />

Citrate, CN ,SCN , tartrate, thiourea<br />

La<br />

Citrate, EDTA, F , oxalate, tartrate, tiron<br />

Mg Citrate, CO 2<br />

2 4 , cyclohexane-1,2-diaminetetraacetic acid, N,N-dihydroxyethylglycine, EDTA,<br />

F , glycol, hexametaphosphate, OH , PO 4<br />

2 7 , triethanolamine<br />

Mn Citrate, CN , 2 , 2,3-dimercap<strong>to</strong>propanol, EDTA, F <br />

CO 2 4 ,Na 5 P 3 O 10 , oxidation <strong>to</strong> MnO4<br />

,<br />

PO 4 2 7 , reduction <strong>to</strong> Mn(II) with NH 2 OH · HCl or hydrazine, sulfosalicylate, tartrate, triethanolamine,<br />

triphosphate, tiron<br />

Mo Acetylace<strong>to</strong>ne, ascorbic acid, citrate, CO 2 , EDTA, F 2 4<br />

,H 2 O 2 , hydrazine, manni<strong>to</strong>l, Na 5 P 3 O 10 ,<br />

NH 2 OH · HCl, oxidation <strong>to</strong> molybdate, SCN , tartrate, tiron, triphosphate

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