THERMAL LENS SPECTROMETRY continued
Table 2 – Comparison of proposed method with reported methods using CPE prior to rhodium determination Reagent
5-(4´-Nitro-2´,6´-dichlorophenylazo)-6- hydroxypyrimidine-2,4-dione
—
Detection system* SP
FAAS
2-Propylpiperidine-1-carbodithioate FAAS O,O-diethyl-dithiophosphate 2-Mercaptobenzothiazole 1-(2-Pyridylazo)-2-naphthol
2-(3,5-Dichloro-2-pyridylazo)-5-di- methylaminoaniline
TLS
ICP/MS ICP/MS TLS
Surfactant Triton X-114 Span 80**
Triton X-114 Triton X-114 Triton X-100 Triton X-114
Triton X-114
*SP, spectrophotometry; FAAS, flame atomic absorption spectrometry. **Span 80 nonionic surfactant from Sigma-Aldrich (St. Louis, Mo.).
DL (ng∙mL-1 0.15 1.2
0.052 0.003 0.001 0.06
0.04 )
Ref. 30
31 32
33 34 21
Present work
Table 3 – Determination of rhodium in water samples Sample no.*
Sample W100301 Tap water
2.0 3.0
— W100302 Tap water
1.0 4.0
— W100303 Well water
1.0 3.0
— W100304 Well water
*W100301: The concentration of Fe3+ 50 ng mL-1
than 200, 50, 50, 50 and 30 ng mL-1 and Cd2+ Fe3+
were 230, 50 and 30 ng mL-1
1.0 4.0
and Mn2+
Added (ng/mL) —
Found (ng/mL) ND
1.93, 1.87, 1.97 1.89, 2.05, 2.04 3.02, 2.97, 2.86 2.89, 2.95, 3.03 ND
1.03, 0.98, 1.04 1.00, 1.04, 0.98 3.95, 4.06, 3.98 3.95, 3.90, 4.05 ND
1.06, 1.05, 0.990 1.08, 1.06, 1.01 2.86, 3.00, 2.90 2.85, 2.92, 2.88 ND
0.980, 0.950, 1.04 0.960, 1.02, 0.980 4.08, 3.82, 3.90 3.90, 3.95, 4.00
was 30 and 10 ng mL-1
Fe3+ were lower than 200, 50, 50, 50 and 30 ng mL-1 , and Pb2+
, Zn2+ and Cd2+ in the water sample, respectively. W100302: The concentration of Mn2+
Average (ng/mL) Recovery (%) —
—
1.96 2.95
—
1.01 3.98
—
1.04 2.90
—
0.988 3.94
, respectively, and Pb2+ , Cu2+ was 10 ng mL-1 , Zn2+ , and Pb2+ in the water sample, respectively. W100303: The concentration of Mn2+
98.0 98.3
—
101 99.5
—
104 96.7
—
98.8 98.5
and Cd2+ , Cu2+
and Cd2+
RSD (%) —
3.9 2.4
—
2.8 1.6
—
3.3 1.9
—
3.5 2.3
were lower than 200, 50, 50 and , Zn2+
Fe3+ was 10 ng mL-1 samples and their analytical results were provided by Xi´an Hydrographic Bureau, Xi´an, Shaanxi Province, China. AMERICAN LABORATORY 30 MAY 2016 , and Pb2+
were lower , Cu2+
, Zn2+
in the water sample, respectively. W100304: The concentration of Mn2+ were lower than 200, 50 and 30 ng mL-1
, Cu2+ and in the water sample, respectively. All the water
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