http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2007081635-A3
Outgoing Links
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|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_928ec5532f1a47d7bfc199b16d9eaa21 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8e1dbd49e062bd39999dc27e542cb8d8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_56f2462fca37c06b14779457b05c18cf http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_745b9ca8734411e96de24e17127228a1 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N33-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N33-0013 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N21-76 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N35-085 |
| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N33-18 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-76 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N35-08 |
| filingDate | 2006-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_189db357e44728ff171aff103ab3a566 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e79f6a9cc5927d086f5d6788b037418d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_385754991403d7ff2fc1eca10ac1e84c |
| publicationDate | 2007-09-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-2007081635-A3 |
| titleOfInvention | Method and apparatus for analyzing arsenic concentrations using gas phase ozone chemiluminescence |
| abstract | A practical sequential injection/zone fluidicsbased analyzer that measures waterborne arsenic is capable of differentiating between inorganic As(III) and As(V). The principle is based on generating AsH3 from the sample in a confined chamber (10) by borohydride reduction at controlled pH, sparging the chamber to drive the AsH3 to a small reflective cell (70) located atop a photomultiplier tube (50), allowing it to react with ozone generated from ambient air, and measuring the intense chemiluminescence that results. Arsine generation and removal from solution results in isolation from the sample matrix, avoiding the pitfalls encountered in some solution-based analysis techniques. The differential determination of As(III) and As(V) is based on the different pH dependence of the reducibility of these species to AsH3. At pH < 1, both As(III) and As(V) are quantitatively converted to arsine in the presence of NaBH4. At a pH of 4 — 5, only As(III) is converted to arsine. In the present form, the limit of detection (S/N = 3) is 0.05 μg/L As at pH ≤ 1 and 0.09 μg/L As(III) at pH ~4 — 5 for a 3-mL sample. The analyzer is intrinsically automated and requires 4 min per determination. In a further embodiment, electrochemical reduction at Cd cathode is used instead of NaBH4 |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101236183-B |
| priorityDate | 2005-12-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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