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preface to fifteenth edition

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11.100 SECTION 11<br />

TABLE 11.37<br />

Anion or<br />

neutral molecule<br />

Boric acid<br />

Br <br />

Br 2<br />

<br />

BrO 3<br />

Chromate(VI)<br />

Citrate<br />

Cl <br />

Cl 2<br />

<br />

ClO 3<br />

<br />

ClO 4<br />

CN <br />

EDTA<br />

F <br />

3<br />

Fe(CN) 6<br />

Germanic acid<br />

I <br />

I 2<br />

<br />

IO 3<br />

<br />

IO 4<br />

<br />

MnO 4<br />

2<br />

MoO 4<br />

<br />

NO 2<br />

Oxalate<br />

Phosphate<br />

S<br />

S 2<br />

Sulfate<br />

Sulfite<br />

2<br />

SO 5<br />

Se and its anions<br />

Te<br />

Tungstate<br />

Vanadate<br />

Masking Agents for Anions and Neutral Molecules<br />

Masking agent<br />

F , glycol, manni<strong>to</strong>l, tartrate, and other hydroxy acids<br />

Hg(II)<br />

Phenol, sulfosalicylic acid<br />

Reduction with arsenate(III), hydrazine, sulfite, or thiosulfate<br />

Reduction with arsenate(III), ascorbic acid, hydrazine, hydroxylamine, sulfite, or thiosulfate<br />

Ca(II)<br />

Hg(II), Sb(III)<br />

Sulfite<br />

Thiosulfate<br />

Hydrazine, sulfite<br />

HCHO, Hg(II), transition metal ions<br />

Cu(II)<br />

Al(III), Be(II), boric acid, Fe(III), Th(IV), Ti(IV), Zr(IV)<br />

Arsenate(III), ascorbic acid, hydrazine, hydroxylamine, thiosulfate<br />

Glucose, glycerol, manni<strong>to</strong>l<br />

Hg(II)<br />

Thiosulfate<br />

Hydrazine, sulfite, thiosulfate<br />

Arsenate(III), hydrazine, molybdate(VI), sulfite, thiosulfate<br />

Reduction with arsenate(III), ascorbic acid, azide, hydrazine, hydroxylamine, oxalic<br />

acid, sulfite, or thiosulfate<br />

Citrate, F ,H 2 O 2 , oxalate, thiocyanate Sn(II)<br />

Co(II), sulfamic acid, sulfanilic acid, urea<br />

Molybdate(VI), permanganate<br />

Fe(III), tartrate<br />

CN ,S 2 , sulfite<br />

Permanganate sulfuric acid, sulfur<br />

Cr(III) heat<br />

HCHO, Hg(II), permanganate sulfuric acid<br />

Ascorbic acid, hydroxylamine, thiosulfate<br />

Diaminobenzidine, sulfide, sulfite<br />

I <br />

Citrate, tartrate<br />

Tartrate<br />

TABLE 11.38 Common Demasking Agents<br />

Abbreviations: DPC,diphenylcarbazide; HDMG,dimethylglyoxime; PAN,1-(2-pyridylazo)-2-naphthol.<br />

Complexing<br />

agent<br />

Ion<br />

demasked<br />

Demasking<br />

agent<br />

Application<br />

CN Ag H Precipitation of Ag<br />

Cd 2 H Free Cd 2<br />

HCHO OH <br />

Detection of Cd (with DPC) in presence<br />

of Cu<br />

Cu H Precipitation of Cu<br />

Cu 2 HgO Determination of Cu<br />

Fe 2 Hg 2 Free Fe 2<br />

Fe 3 HgO Determination of Fe

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