JPS61280559A - Continuous amperometric titration type determination device for nitrite or nitrate existing in aqueous medium - Google Patents
Continuous amperometric titration type determination device for nitrite or nitrate existing in aqueous mediumInfo
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- JPS61280559A JPS61280559A JP61086966A JP8696686A JPS61280559A JP S61280559 A JPS61280559 A JP S61280559A JP 61086966 A JP61086966 A JP 61086966A JP 8696686 A JP8696686 A JP 8696686A JP S61280559 A JPS61280559 A JP S61280559A
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- electrode
- nitrite
- buffer
- nitrate
- ammonium chloride
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
- G01N27/4045—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors for gases other than oxygen
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、水性媒体に存在する亜硝酸塩ないし硝酸塩の
連続電流測定式定量
（ａｍｐｏｒｏｍｅｔｒｉｃ ｑｕａｎｔｉｔｙ ｄｅ
ｔｅｒｍｉｎａｔｉｏｎ）装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous amperometric quantitative determination of nitrite or nitrate present in an aqueous medium.
termination) device.
量を測定する成る数の方法並びに装置が、既知である。A number of methods and devices for measuring quantities are known.
このように、亜硝酸塩の定量は、比色法または電気化学
的方法のいずれかを使用して今まで不連続的に行われて
いる。Thus, nitrite quantification has hitherto been carried out discontinuously using either colorimetric or electrochemical methods.
第一のものは、分光側光法によって測定されるその濃度
が試料の亜硝酸塩含量に比例するアゾイック染料を生成
することからなる同一原理の各種の適応である。電気化
学的方法に関しては、それらは、事実、高性能液体クロ
マトグラフィーによって亜硝酸塩と硝酸塩との分離後、
または試料の硝酸塩含量の事前両足後のいずれかに事実
多分実験室で通用できるだけの方法である２つの方法（
一方＆′＠嵯圧電流滴定法であり、他方は１１Ｌ童滴定
法である）からなる。The first is various adaptations of the same principle, consisting in producing azoic dyes whose concentration, measured by spectrophotometry, is proportional to the nitrite content of the sample. As for electrochemical methods, they are in fact effective after separation of nitrite and nitrate by high performance liquid chromatography.
The fact is that either the pre- or post-test nitrate content of the sample is probably the only method that can be passed in the laboratory (
One is the pressure amperometric titration method, and the other is the 11L titration method).
試料を予め脱酸素することが必要であるので、これらの
電気化学的方法は、連続的には使用できない。事実、検
出は、還元によって行われる。These electrochemical methods cannot be used continuously as it is necessary to deoxygenate the sample beforehand. In fact, detection is performed by reduction.
硝酸塩のｔ全連続的に測定する装置か、既知である。Devices for continuously measuring nitrate are known.
例えは、仏１％許出願第１’Ｒ−Ａ−，２２１，！ｒ
０９３ 号明細書は、コつの白金電極、記録計と関連さ
れたマイクロアンペア酊からなるビ（ｂｌ）−電流滴定
式定ｉｔ装置に圓する。応用例として、硝酸塩含量の測
定が与えられる。部ち、硝酸塩は、ヨウ素イオンを使用
して亜硝酸塩に予め還元される。この装置は、亜硝酸塩
含量に比例するヨウ素含ｉｊｋを測定すること全可能に
する。亜硝酸塩含量か事前の測定によって既知であるな
らば、硝酸塩含量は、それから演紳され得る。従って、
事実、第三元素、その場合に当てはまる例証であるヨウ
素の濃度が測定されるので、それは、硝酸塩含量の間接
測定の問題である。For example, French 1% patent application No. 1'R-A-, 221,! r
No. 093 is directed to a bi(bl)-amperometric titration device consisting of a single platinum electrode, a microamplifier associated with a recorder. As an application example, the measurement of nitrate content is given. First, nitrate is previously reduced to nitrite using iodine ions. This device makes it possible to measure the iodine content, which is proportional to the nitrite content. If the nitrite content is known by prior measurement, the nitrate content can then be calculated. Therefore,
In fact, it is a matter of indirect measurement of the nitrate content, since the concentration of a third element, iodine being an illustrative example in that case, is measured.
硝酸塩の連続電流滴定式定量装置を提供することにある
。An object of the present invention is to provide a continuous current titration type determination device for nitrate.
本発明の別の目的は、水性媒体、更に詳細には塩水（ａ
ａｌｉｎｅ）または非塩水に存在する亜硝酸塩な装置を
提供することにある。Another object of the invention is to provide aqueous media, more particularly salt water (a
The object of the present invention is to provide a device in which nitrites are present in aline or non-saline water.
←ゆ＋硝酸塩の連続電流滴定式定量装置であって、電極
を備えている循環セル、この電極に接続されたマイクロ
アンペア計、流体の流れ方向に関してこのセルの上流方
向に位置づけられ、そして一方で緩衝液溜めに連結され
かつ他方でその亜硝酸塩ある液体源に連結される混合タ
ンクを具備する装置によって達成される。← Continuous amperometric titration device for nitrate, comprising: a circulation cell comprising an electrode, a microampmeter connected to the electrode, positioned upstream of the cell with respect to the direction of fluid flow; This is achieved by a device comprising a mixing tank connected to a buffer reservoir and, on the other hand, to a liquid source containing the nitrite.
有利には本発明の装置はまた混合タンクと循環セルの間
に位置する、硝酸塩を亜硝酸塩に還元するための装置を
有している。Advantageously, the device according to the invention also has a device for reducing nitrate to nitrite, located between the mixing tank and the circulation cell.
この還元装置は銅被覆カドミウム又は銅被覆カドミウム
流動床反応器によって形成されるのが好ましい。This reduction device is preferably formed by a copper-coated cadmium or copper-coated cadmium fluidized bed reactor.
有利には、本装置は、混合タンクを液体源および緩衝液
溜めに連結するダクト内に配置された嬬動性（ｐｅｒｌ
ｇｔａｌｔｉｅ）二方ポンプも具備する。Advantageously, the device comprises a perturbation device arranged in a duct connecting the mixing tank to a liquid source and a buffer reservoir.
A two-way pump is also provided.
有利には本装置はまた循環セルの温度の変動による影響
を自動的に補正するための装置をそなえを測定すべき液
体を、それが緩衝液と混合される前にｒ遇するための装
置を有することが好ましい。Advantageously, the device also includes a device for automatically compensating for effects due to temperature fluctuations in the circulation cell, and a device for conditioning the liquid to be measured before it is mixed with the buffer solution. It is preferable to have.
好ましくはマイクロアンペア計は記録マイクロアンペア
計である。Preferably the microampmeter is a recording microampmeter.
電極はガラス（ｖｉｔｒｅｏｕｓ）炭素電極又は白金電
極が好ましい。後者の場合、白金電極の電位はカロメル
電極に対して約１ｏｑｏ （土！０）ｍＶとするのが有
利である。The electrode is preferably a vitreous carbon electrode or a platinum electrode. In the latter case, it is advantageous for the potential of the platinum electrode to be approximately 10 mV with respect to the calomel electrode.
緩衝液は電流滴定式定量に用いる亜硝酸塩の４５酸塩へ
の電気的酸化を良好な収率で行えるものでなくてはなら
ない。この目的のため緩衝液は６〜ｇの範囲、たとえば
６．５〜７．５の範囲のｐＨを有するのが好ソしい。電
極の近辺に最小のｐＨ勾配があるように緩衝効果が非常
に強いのが有利である。The buffer must be capable of electrooxidizing nitrite to the 45-acid salt for use in amperometric determination with good yield. For this purpose, the buffer preferably has a pH in the range 6 to 7.5, for example in the range 6.5 to 7.5. Advantageously, the buffering effect is very strong so that there is a minimum pH gradient in the vicinity of the electrode.
本発明の装置が硝酸塩を亜硝酸塩へ還元するための装置
を有していれば、緩衝液はまた定量的還元を行ない前記
装置に長℃・寿命を期待しうるものでなくてはならない
。If the apparatus of the present invention has a device for reducing nitrate to nitrite, the buffer must also be capable of quantitative reduction and provide the device with a long life expectancy.
例えばこの装置が銅被覆されたカドミウムコラム又は銅
被覆されたカドミウム流動床反応器である場合、これら
の結果は適当なｐＨ１特に６〜ｇの範囲のｐＨを有する
緩衝液を用い銅とカドミウムカチオンの錯化を経て可溶
化することを必要とする。For example, if the apparatus is a copper-coated cadmium column or a copper-coated cadmium fluidized bed reactor, these results are consistent with the reaction of copper and cadmium cations using a buffer with a suitable pH 1, particularly in the range of 6 to 6 g. Requires solubilization via complexation.
更にこの緩衝液は亜硝酸塩に縫−及は硝酸塩含有量を測
定すべき液体に存在する金属の水酸化物又は炭酸塩を析
出させてはならなり・。Furthermore, the buffer must not interfere with nitrite or precipitate metal hydroxides or carbonates present in the liquid whose nitrate content is to be determined.
この緩衝液は塩化アンモニウム、ピコリン酸（ビリジン
コーカルボン酸）とリン酸−カリウム又はクエン酸を含
有するのが有利である。This buffer advantageously contains ammonium chloride, picolinic acid (pyridinecocarboxylic acid) and potassium phosphate or citric acid.
本発明の第一態様においては、この緩衝液は、塩化アン
モニウム０．ＡＭ、 リン酸−カリウムθ、θ−Ｍお
よびピコリン酸０，０／ Ｍを含有し、そしてｐＨ約７
．５を有する。In a first embodiment of the invention, the buffer contains 0.0% ammonium chloride. AM, contains potassium phosphate θ, θ-M and picolinic acid 0,0/M and has a pH of about 7
．． 5.
第二態様においては、この緩衝液は、塩化アンモニウム
０．２Ｍ、 リン酸−カリウム０．０２ Ｍオヨびピ
コリン酸０，１Ｍを含有し、そしてｐＨ約６．５を有す
る。In a second embodiment, the buffer contains 0.2M ammonium chloride, 0.02M potassium phosphate and 0.1M picolinic acid, and has a pH of about 6.5.
本発明の第三態様においては、緩衝液は、塩化アンモニ
ウム０．：１Ｍ１クエン酸０．０！； Ｍおよびピコリ
ン酸０，０／ Ｍを含有し、そしてｐＨ約７を有する。In a third aspect of the invention, the buffer comprises 0.0% ammonium chloride. :1M1citric acid 0.0! ; M and picolinic acid 0,0/M and has a pH of about 7.
限定特性を有していない以下の説明は、添付図面を参照
する。The following non-limiting description refers to the accompanying drawings.
このように、第７図から明らかなように、水性Ｔ；ψＶ
媒体に存在する亜硝酸塩゛ 硝酸塩の連続定量
装置は、白金電極コを備えている循環セル／を具備する
。この電極は、一方でエネルギー源３に接続され、そし
て他方でマイクロアンペア計弘に接続される。Thus, as is clear from FIG. 7, the apparatus for continuous determination of nitrite and nitrate present in an aqueous T;ψV medium comprises a circulation cell equipped with a platinum electrode. This electrode is connected on the one hand to an energy source 3 and on the other hand to a microampere meter.
本装置は、流体の流れ方向Ｆでセルｌの上流方このタン
クは、一方で、その亜硝酸塩分ｔチ←ト勘硅→硝酸塩含
量が測定されるべきである液体源に連結され、そして他
方で、緩衝液溜め乙に連結される。二方嬬動性ボンプク
は、それぞれ溜めるおよび液体源をタンクＳに連結する
ダクトサおよび９に配置される。The device is constructed such that this tank upstream of the cell l in the fluid flow direction F is connected on the one hand to the liquid source whose nitrite content is to be measured, and on the other hand It is connected to the buffer reservoir B. Bidirectional pumps are arranged in the ducts and 9 connecting the reservoir and liquid source to the tank S, respectively.
マイクロアンペア計りは、記録マイクロアンペア計であ
る。このマイクロアンペア計によって測定される電流は
、水性媒体に含有される亜硝酸塩ｒ；φし
・−゛−−−２． 硝酸塩の量に比例する。A microampmeter is a recording microampmeter. The current measured by this microamp meter is calculated by the amount of nitrite contained in the aqueous medium. Proportional to the amount of nitrate.
電源３に関しては、それは、カロメル電極に関して約７
０ダＯｍＶ（±、ｔＯｍＶ）の電位を電極コの端子にか
けさせる。Regarding power supply 3, it is about 7
A potential of 0 da OmV (±, tOmV) is applied to the terminals of the electrodes.
溜め乙に含有される緩衝液１０は、塩化アンモニウム（
ＮＨ４Ｃｌ ）、ピコリン酸とリン酸−カリウムもしく
はリン酸二水素カリウム（ＫＨ２ＰＯ４）、またはコハ
ク酸を含有する。The buffer solution 10 contained in the reservoir B contains ammonium chloride (
NH4Cl), picolinic acid and potassium phosphate or potassium dihydrogen phosphate (KH2PO4), or succinic acid.
以下の表／に、緩衝液ｉｏの３種の組成物を示す。The table below shows three compositions of buffer io.
前記溶液Ａ／は、水性媒体が淡水である時に亜に特に意
図され、一方溶液＆コは、水性媒体が海水である時に好
ましい。The solution A/ is particularly intended when the aqueous medium is fresh water, while the solution &co is preferred when the aqueous medium is seawater.
水性媒体にマグネシウムおよびカルシウムが高度に仕込
まれているならば、ピコリン酸の量を約０．２Ｍの濃度
に増大することが必要であろう。このことは、従って、
希釈率を修正させ、そして多分ｐＨを修正させるであろ
う。If the aqueous medium is highly loaded with magnesium and calcium, it may be necessary to increase the amount of picolinic acid to a concentration of about 0.2M. This means that, therefore,
The dilution rate will be modified and possibly the pH.
溶液厘３は、硬水および海水の場合に特に適している。Solution bottle 3 is particularly suitable for hard water and seawater.
ポンプ７の流量は、緩衝液１０流と水性液体との間の比
率が６．Ａ、２％程度であるように調整される。The flow rate of the pump 7 is such that the ratio between the buffer solution 10 flow and the aqueous liquid is 6. A: It is adjusted to be about 2%.
第二図に概略的に示される装置は、タンク５とセル／と
の間に配置されている硝酸塩を亜硝酸塩に還元する装置
ｌ／を更に具備する以外は、前記のものと同一である。The apparatus shown schematically in FIG. 2 is identical to that described above, except that it further comprises a device l/ for reducing nitrate to nitrite, which is located between the tank 5 and the cell l/.
第１図は本発明に係る装置の略図、第２図は硝酸塩を亜
硝酸塩に還元する装置を具備するこのよの略図である。
ｌ・・・循環セル、コ・・・電極、グ・・・マイクロア
ンペア計、５・・・混合タンク、６・・・溜め、７・・
・ポンプ、す、テ・・・ダクト、１０・・・緩衝液、／
／・・・還元装置。FIG. 1 is a schematic diagram of an apparatus according to the invention, and FIG. 2 is a schematic diagram of such a device comprising a device for reducing nitrate to nitrite. L...Circulation cell, Co...Electrode, G...Microampere meter, 5...Mixing tank, 6...Reservoir, 7...
・Pump, te... duct, 10... buffer solution, /
/...reduction device.
Claims (1)
（２）に接続されるマイクロアンペア計（４）、水性媒
体の循環方向に関して前記セル（１）の上流方向に位置
付けられ、そして一方で緩衝液（１０）の溜め（６）に
連結され、かつ他方でその亜硝酸塩および（または）硝
酸塩含量が測定されるべきである液体源に連結される混
合タンク（５）を具備することを特徴とする水性媒体に
存在する亜硝酸塩ないし 硝酸塩の連続電流滴定式定量装置。 ２、前記混合タンク（５）を液体源および前記緩衝液溜
め（６）に連結するダクト（８、９）内の二方蠕動性ポ
ンプ（７）も具備する特許請求の範囲第１項に記載の装
置。 ３、前記マイクロアンペア計が、記録マイクロアンペア
計である特許請求の範囲第１項または第２項に記載の装
置。 ４、前記電極（２）はガラス炭素電極又は白金電極であ
る特許請求の範囲第１〜３項のいずれかに記載の装置。 ５、前記電極（２）はその電位が、カロメル電極に関し
て約１０４０ｍＶである白金電極である特許請求の範囲
第４項に記載の装置。 ６、前記循環セル（１）の温度の変動の影響を自動的に
補正する装置も具備する特許請求の範囲第１項〜第５項
のいずれかに記載の装置。 ７、前記緩衝液は６〜８の範囲のｐＨを有する特許請求
の範囲第１〜６項のいずれかに記載の装置。 ８、前記緩衝液は６．５〜７．５の範囲のｐＨを有する
特許請求の範囲第１〜７項のいずれかに記載の装置。 ９、前記緩衝液（１０）が、塩化アンモニウム、ピコリ
ン酸およびリン酸−カリウムまたはクエン酸を含有する
特許請求の範囲第７項又は第８項に記載の装置。 １０、前記緩衝液（１０）が、塩化アンモニウム０．２
Ｍ、リン酸−カリウム０．０２Ｍおよびピコリン酸０．
０１Ｍを含有し、そしてｐＨ約７．５を有する特許請求
の範囲第９項に記載の装置。 １１、前記緩衝液（１０）が、塩化アンモニウム０．２
Ｍ、リン酸−カリウム０．０２Ｍおよびピコリン酸０．
１Ｍを含有し、そしてｐＨ約６．５を有する特許請求の
範囲第９項に記載の装置。 １２、前記緩衝液（１０）が、塩化アンモニウム０．２
Ｍ、クエン酸０．０５Ｍおよびピコリン酸０．０１Ｍを
含有し、そしてｐＨ約７を有する特許請求の範囲第９項
に記載の装置。 １３、前記混合タンク（５）と前記循環セル（１）との
間に配置される硝酸塩を亜硝酸塩に還元する装置（１１
）も具備する特許請求の範囲第１項〜第１２項のいずれ
かに記載の装置。 １４、前記装置（１１）が、銅被覆カドミウムカラム又
は銅被覆カドミウム流動床反応器によって形成される特
許請求の範囲第１３項に記載の装置。[Claims] 1. A circulation cell (1) comprising an electrode (2), a microampmeter (4) connected to said electrode (2), a control of said cell (1) with respect to the direction of circulation of the aqueous medium. a mixing tank located in the upstream direction and connected on the one hand to a reservoir (6) of the buffer solution (10) and on the other hand to the liquid source whose nitrite and/or nitrate content is to be measured; A continuous current titration type quantitative determination device for nitrite or nitrate present in an aqueous medium, characterized by comprising (5). 2. Also comprising a two-way peristaltic pump (7) in a duct (8, 9) connecting said mixing tank (5) to a liquid source and to said buffer reservoir (6). equipment. 3. The device according to claim 1 or 2, wherein the microamperemeter is a recording microamperemeter. 4. The device according to any one of claims 1 to 3, wherein the electrode (2) is a glass carbon electrode or a platinum electrode. 5. The device according to claim 4, wherein the electrode (2) is a platinum electrode whose potential is approximately 1040 mV with respect to the calomel electrode. 6. The device according to any one of claims 1 to 5, further comprising a device for automatically compensating for the influence of temperature fluctuations in the circulation cell (1). 7. The device according to any one of claims 1 to 6, wherein the buffer has a pH in the range of 6 to 8. 8. The device according to any one of claims 1 to 7, wherein the buffer has a pH in the range of 6.5 to 7.5. 9. The device according to claim 7 or 8, wherein the buffer (10) contains ammonium chloride, picolinic acid and potassium phosphate or citric acid. 10. The buffer solution (10) contains ammonium chloride 0.2
M, potassium phosphate 0.02M and picolinic acid 0.
10. The device of claim 9, containing 0.01M and having a pH of about 7.5. 11. The buffer solution (10) contains ammonium chloride 0.2
M, potassium phosphate 0.02M and picolinic acid 0.
10. The device of claim 9 containing 1M and having a pH of about 6.5. 12. The buffer solution (10) contains ammonium chloride 0.2
10. The device of claim 9, containing M, 0.05M citric acid and 0.01M picolinic acid and having a pH of about 7. 13. A device (11) for reducing nitrate to nitrite, which is disposed between the mixing tank (5) and the circulation cell (1).
13. A device according to any one of claims 1 to 12, further comprising: ). 14. The device according to claim 13, wherein the device (11) is formed by a copper-coated cadmium column or a copper-coated cadmium fluidized bed reactor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8505599A FR2580404B1 (en) | 1985-04-15 | 1985-04-15 | DEVICE FOR THE CONTINUOUS AMPEROMETRIC ASSAY OF NITRITES AND / OR NITRATES WHICH ARE PRESENT IN ANY AQUEOUS MEDIUM |
| FR8505599 | 1985-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61280559A true JPS61280559A (en) | 1986-12-11 |
Family
ID=9318205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61086966A Pending JPS61280559A (en) | 1985-04-15 | 1986-04-15 | Continuous amperometric titration type determination device for nitrite or nitrate existing in aqueous medium |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS61280559A (en) |
| DE (1) | DE3612387A1 (en) |
| FR (1) | FR2580404B1 (en) |
| GB (1) | GB2174207B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010197383A (en) * | 2009-01-30 | 2010-09-09 | Meidensha Corp | Method and apparatus for measuring nitrite nitrogen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2603699B1 (en) * | 1986-04-15 | 1990-08-03 | Univ Languedoc | DEVICE FOR THE CONTINUOUS AMPEROMETRIC ASSAY OF NITRITES AND / OR NITRATES WHICH ARE PRESENT IN ANY AQUEOUS MEDIUM |
| DE3729287A1 (en) * | 1987-09-02 | 1989-03-23 | Draegerwerk Ag | ELECTROCHEMICAL MEASURING CELL WITH AN ACID ELECTROLYTE |
| DE4222982C2 (en) * | 1992-07-13 | 1996-04-11 | Lange Gmbh Dr Bruno | Procedure for the rapid determination of the total nitrogen content |
| EP3330230A1 (en) | 2016-11-30 | 2018-06-06 | Eawag | Method and apparatus for the nitrification of high-strength aqueous ammonia solutions |
| CN113588760B (en) * | 2021-07-05 | 2023-06-13 | 江苏大学 | Method for detecting nitrite ions through ratio type electrochemistry |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3314863A (en) * | 1963-09-16 | 1967-04-18 | Beckman Instruments Inc | Gas analysis |
| US3881997A (en) * | 1974-03-27 | 1975-05-06 | Univ Iowa State Res Found Inc | Method for voltammetric determination of nitrate and nitrite |
| US4085009A (en) * | 1976-07-28 | 1978-04-18 | Technicon Instruments Corporation | Methods for determination of enzyme reactions |
-
1985
- 1985-04-15 FR FR8505599A patent/FR2580404B1/en not_active Expired
-
1986
- 1986-04-12 DE DE19863612387 patent/DE3612387A1/en not_active Withdrawn
- 1986-04-15 GB GB08609125A patent/GB2174207B/en not_active Expired
- 1986-04-15 JP JP61086966A patent/JPS61280559A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010197383A (en) * | 2009-01-30 | 2010-09-09 | Meidensha Corp | Method and apparatus for measuring nitrite nitrogen |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2580404A1 (en) | 1986-10-17 |
| GB2174207A (en) | 1986-10-29 |
| FR2580404B1 (en) | 1988-04-22 |
| DE3612387A1 (en) | 1986-10-16 |
| GB8609125D0 (en) | 1986-05-21 |
| GB2174207B (en) | 1989-02-08 |
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