WO2015029624A1 - pH自動調整装置 - Google Patents
pH自動調整装置 Download PDFInfo
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- WO2015029624A1 WO2015029624A1 PCT/JP2014/068819 JP2014068819W WO2015029624A1 WO 2015029624 A1 WO2015029624 A1 WO 2015029624A1 JP 2014068819 W JP2014068819 W JP 2014068819W WO 2015029624 A1 WO2015029624 A1 WO 2015029624A1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/80—Indicating pH value
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/14—Process control and prevention of errors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0627—Sensor or part of a sensor is integrated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/06—Valves, specific forms thereof
- B01L2400/0622—Valves, specific forms thereof distribution valves, valves having multiple inlets and/or outlets, e.g. metering valves, multi-way valves
Definitions
- the present invention relates to an automatic pH adjusting device, and more particularly to an automatic pH adjusting device used for pH adjustment as a pretreatment for solid phase extraction.
- trace elements including heavy metals is conducted for the study of material circulation in the ocean, water quality inspection of tap water, water quality survey of lake water and river water.
- Non-Patent Document 1 an indirect measurement method using the discoloration characteristic of a pH indicator.
- an optical sensor is used as a pH measurement device, contamination caused by contact between the measurement device and the sample can be eliminated.
- methyl yellow, methyl orange or methyl red is used as a pH indicator, and ammonia is used as a pH adjusting solution.
- Non-Patent Document 1 the present inventors are considering adopting a sprayer as a pH adjusting liquid supply device. This is because, according to the nebulizer, the pH adjustment liquid can be sucked and atomized by the carrier gas, so that the bias in the hydrogen concentration distribution in the sample is reduced and adjusted compared to the case where the pH adjustment liquid is supplied in the liquid state. This is because it is possible to stably reach the target pH.
- an object of the present invention is to provide an automatic pH adjusting device capable of stably adjusting pH when a sprayer is employed as a pH adjusting liquid supply device.
- a first invention is an automatic pH adjusting device, a container containing a liquid sample to which a pH indicator that changes color according to pH is added; an adjustment liquid bottle for storing ammonia water or carbonated water as a pH adjustment liquid; A sprayer provided with an injection port arranged to face the sample liquid surface in the container, and spraying the pH adjustment liquid in the adjustment liquid bottle atomized by the carrier gas from the injection port; A liquid injection state in which the sprayer and the adjustment liquid bottle are arranged to communicate with each other and the pH adjustment liquid is injected from the injection port; and the sprayer and the outside air are connected to each other and the injection port.
- a multi-way valve that switches between an air injection state in which air is injected from A detection device for detecting the intensity of light irradiated from the outside of the container and transmitted through the container; A control device that switches the communication state of the multi-way valve based on the intensity of light detected by the detection device; It is characterized by providing.
- the detection device is configured to be able to detect the intensity of light of a specific wavelength that is absorbed by the pH indicator and the intensity of light of a reference wavelength that is not absorbed by the pH indicator when the sample is adjusted to a target pH.
- the control device calculates an intensity ratio from the light intensity of the specific wavelength and the reference wavelength detected by the detection device, and compares the calculated intensity ratio with a target intensity ratio set according to the target pH.
- the communication state of the multi-way valve is configured to be switched.
- the control device When the ratio of the calculated intensity ratio to the target intensity ratio is within a predetermined range including 1, the control device is configured to shorten the period of the liquid ejection state as the ratio approaches 1. It is characterized by that.
- the communication state of the multi-way valve can be switched based on the intensity of light transmitted through the container containing the liquid sample.
- This switching of the communication state is performed between a state in which the sprayer and the adjustment liquid bottle are in communication (liquid injection state) and a state in which the sprayer is in communication with outside air (air injection state).
- the liquid injection state the pH adjustment liquid in the adjustment liquid bottle can be sent to the sprayer and injected from the injection port.
- the bubbles of the pH adjusting liquid generated in the sprayer can be pushed out by air and injected from the spray port of the sprayer together with the pH adjusting liquid remaining in the sprayer. Therefore, it is possible to suppress the generation of a large amount of bubbles of the pH adjusting liquid in the nebulizer. Therefore, pH adjustment can be performed stably.
- the communication state of the multi-way valve can be switched by comparing the calculated intensity ratio with the target intensity ratio calculated based on the intensity of the reference wavelength light. Therefore, since the influence of the nonuniformity of the container and the difference in the installation position of the container can be minimized, the pH of the sample can be stably adjusted.
- the third invention when the ratio of the calculated intensity ratio to the target intensity ratio is within a predetermined range including 1, the period of the liquid injection state is shortened as the ratio approaches 1, so the pH of the sample is As the target pH is approached, the injection amount of the pH adjusting liquid can be reduced. Therefore, the pH of the sample can be adjusted to the target pH.
- FIG. 3 is an enlarged schematic diagram of a nebulizer 28.
- FIG. FIG. 6 is a diagram for explaining the operation of the three-way valve 40. It is a flowchart which shows the processing routine performed in PC42.
- FIG. 1 is a schematic diagram showing the configuration of the automatic pH adjusting device of the present embodiment.
- the automatic pH adjusting device 10 of this embodiment is a device for automatically adjusting the pH of the liquid sample 12 to which a pH indicator (methyl yellow, methyl orange or methyl red) has been added.
- the pH automatic adjustment device 10 includes a container 14 including a rectangular main body portion 14 a that can store a sample 12 and an opening portion 14 b for taking in and out the sample 12.
- the container 14 is a transparent container made of polypropylene. However, as long as it exhibits a high permeability to both light of a particular wavelength lambda a and the reference wavelength lambda r will be described later, the material of the container 14 is not particularly limited.
- the main body 14 a is installed on the stirrer 16.
- a stirrer 18 is installed inside the main body 14a.
- the stirrer 16 rotates the stirrer 18 at a low speed by an electromagnetic coil.
- the sample 12 can be gently stirred by rotating the stirring bar 18 at a low speed.
- the stirrer 18 is not particularly limited as long as it is of a shape and material that does not wear due to contact with the main body 14a during rotation.
- a light source 20 for generating light of a particular wavelength lambda a and the reference wavelength lambda r, and the pinhole plate 22 is installed on one side of the body portion 14a.
- the light source 20 for example, an LED light source, a halogen light source, a tungsten lamp, or the like is employed.
- a pinhole 22a that transmits a part of the light beam generated by the light source 20 is provided in the center of the pinhole plate 22.
- a spectroscope 26 for measuring the pinhole plate 24 in which the pin holes 24a formed in the center thereof, a signal strength I a and the reference wavelength light signal intensity I r of the specific wavelength light And are installed.
- a photodiode, an optical sensor, or the like having sufficient sensitivity to the specific wavelength light and the reference wavelength light may be used.
- the pH automatic adjusting device 10 includes a nebulizer 28 that can inject the ammonia water 36.
- the nebulizer 28 is attached to a height adjusting member (not shown), and is inserted into the main body 14a from the opening 14b side. The height of the injection port 28 a of the nebulizer 28 is adjusted so as not to contact the liquid level of the sample 12.
- FIG. 2 is an enlarged schematic view of the nebulizer 28.
- the nebulizer 28 includes a gas supply pipe 30 that can circulate nitrogen gas as a carrier gas, and a liquid supply pipe 32 that can circulate ammonia water 36.
- the gas supply pipe 30 includes a gas supply port 30a and a gas injection port 30b.
- the gas supply port 30a is connected to a compressor (not shown) that compresses and discharges nitrogen gas.
- the liquid supply pipe 32 includes a liquid supply port 32a and a liquid ejection port 32b.
- the liquid supply port 32 a is connected to a non-metallic tube 34.
- FIG. 2 shows a coaxial nebulizer having a double pipe structure in which a liquid supply pipe 32 is arranged inside the gas supply pipe 30, but in addition, a coaxial type having a multiple pipe structure, a cross flow, Nebulizers characterized by a fine spray of the mold can also be used.
- the nebulizer 28 is connected via a tube 34 to an adjustment liquid bottle 38 that contains ammonia water 36 as a pH adjustment liquid.
- an electromagnetic multi-way valve (three-way valve) 40 is provided in the middle of the tube 34.
- the three-way valve 40 includes an internal passage 40a and an outside air communication pipe 40b.
- FIG. 3 is a diagram for explaining the operation of the three-way valve 40.
- the nebulizer 28 and the adjustment liquid bottle 38 communicate with each other (open state).
- the nebulizer 28 communicates with the outside air (closed state).
- the pH automatic adjustment device 10 includes a PC 42 as a control device.
- the spectroscope 26 is connected to the input side of the PC 42, and the transmitted light signal 44 from the spectroscope 26 is input to the PC 42.
- a three-way valve 40 is connected to the output side of the PC 42 via an I / O board 46, and an open / close signal 48 from the PC 42 is input to the three-way valve 40.
- the stirrer 16 and the height adjusting member may be connected to the output side of the PC 42.
- a substrate integrated controller may be used instead of the PC 42 and the I / O board 46.
- the PC 42 is configured to calculate an arrival rate f (described later) of pH adjustment based on the transmitted light signal 44, output an opening / closing signal 48 in accordance with the arrival rate f, and control the opening / closing state of the three-way valve 40. ing.
- Various calculation models and maps are stored in advance in the internal memory of the PC 42. For example, an algorithm for calculating the arrival rate f, a signal intensity map indicating the correlation between pH and signal intensity I, and the like are stored.
- the signal intensity map is created, for example, by irradiating a sample having a known pH with light having a preset wavelength and measuring the intensity of the set wavelength transmitted through the sample to obtain a correlation.
- the arrival ratio f i is expressed as a ratio of the current value R i of the signal strength ratio to the target value R 0 of the signal strength ratio.
- the current value R i is expressed as a ratio of the signal intensity I a of the specific wavelength to the signal intensity I r of the reference wavelength.
- FIG. 4 is a flowchart showing a pH adjustment routine executed in the PC 42 in the present embodiment.
- the target pH, the particular wavelength lambda a and the reference wavelength lambda r, assumed to be input to PC42 are determined in accordance with the color change characteristics of the pH indicator.
- the three-way valve 40 is controlled to be closed.
- step 100 the value of the number of repetitions n is set to zero (step 100).
- the number of repetitions n is counted every time the arrival rate f is measured once, and the count at the previous adjustment is reset by performing the processing of step 100.
- a target value R0 of the signal intensity ratio is calculated from the target pH (step 102). Specifically, first, a map corresponding to the target pH is searched from the signal intensity map, and signal intensities I a0 and I r0 corresponding to the specific wavelength ⁇ a and the reference wavelength ⁇ r are calculated. Then, the target value R 0 is calculated by dividing the signal intensity I a0 by the signal intensity I r0 .
- the signal intensities I a and I r are measured (step 104). Specifically, the signal intensities I a and I r are measured by alternately irradiating light having a specific wavelength ⁇ a and a reference wavelength ⁇ r from the light source 20. Based on the transmitted light signal 44 input from the spectroscope 26 to the PC 42 during irradiation with the specific wavelength light, the signal intensity Ia is measured. Based on the transmitted light signals 44 inputted from the spectroscope 26 while the reference wavelength light irradiated on the PC 42, the signal intensity I r is measured.
- a current value R i of the signal strength ratio is calculated (step 106). Specifically, the current value R i is calculated by dividing the signal intensity I a measured in step 104 by the signal intensity I r .
- arriving ratio f i is calculated (step 108). Specifically, the arrival rate f i is calculated by dividing the current value R i calculated in step 106 by the target value R 0 calculated in step 102.
- the arrival rate f i is evaluated (steps 110 to 136). Specifically, first, it is determined whether or not the reaching ratio f i ⁇ 1 is satisfied (step 110). If it is determined that the arrival rate f i ⁇ 1 is satisfied, it is determined whether 0.95 ⁇ the arrival rate f i is satisfied (step 112). 0.95 ⁇ If arriving ratio f i is determined to be satisfied, it is determined whether 0.97 ⁇ arriving ratio f i is satisfied (step 114). 0.97 ⁇ If arriving ratio f i is determined to be satisfied, it is determined whether 0.99 ⁇ arriving ratio f i is satisfied (step 116). 0.99 ⁇ If arriving ratio f i is determined to be established, to count the number of repetitions n (step 118).
- step 110 If it is determined in step 110 that the reaching ratio f i ⁇ 1 does not hold, the process proceeds to step 118.
- step 112 0.95 ⁇ if arriving ratio f i is determined not to be satisfied, the three-way valve 40 is controlled to the open state (step 120). Thereby, the ammonia water 36 in the adjustment liquid bottle 38 is sent to the nebulizer 28 and is ejected from the liquid ejection port 32b.
- step 120 After the process of step 120, the process returns to step 104 and the signal intensities I a and I r are measured. That is, the processing returns from step 120 to step 104 is repeated until 0.95 ⁇ arriving ratio f i is satisfied.
- step 114 If it is determined in step 114 that 0.97 ⁇ arrival rate f i does not hold, the three-way valve 40 is controlled to open (step 122), and a waiting time (0.1 second) is measured (step 124). ). Thereby, the ammonia water 36 in the adjustment liquid bottle 38 is sent to the nebulizer 28 until the waiting time elapses, and is ejected from the liquid ejection port 32b. After the waiting time has elapsed, the three-way valve 40 is controlled to be closed (step 126), and the waiting time is remeasured (step 128).
- the air on the outside air communication pipe 40b side is sent to the nebulizer 28 until the waiting time elapses, and is ejected from the liquid ejection port 32b together with the ammonia water remaining in the nebulizer 28.
- the process returns to step 104 and the signal intensities I a and I r are measured. That is, the process returns to step 104 via step 122, 124, 126, 128 are repeatedly executed until 0.97 ⁇ arriving ratio f i is satisfied.
- step 116 If it is determined in step 116 that 0.99 ⁇ arrival rate f i is not satisfied, the three-way valve 40 is controlled to be in an open state (step 130), and a waiting time (0.05 seconds) is measured (step 132). ). After the waiting time has elapsed, the three-way valve 40 is controlled to be closed (step 134).
- the processing of steps 130, 132, and 134 is basically the same as the processing of steps 122, 124, and 126. However, the waiting time in step 132 is set shorter than the waiting time in step 124. After the process of step 134, the waiting time is remeasured (step 136). The waiting time in step 136 is set to be the same as the waiting time in step 128.
- step 136 After the process of step 136, the process returns to step 104, and the signal strengths I a and I r are measured. That is, the process returns to step 104 via step 130, 132, 134, and 136 are repeatedly executed until 0.99 ⁇ arriving ratio f i is satisfied.
- step 118 it is determined whether the number of repetitions n ⁇ 3 is satisfied (step 138). By performing the determination in step 138, the accuracy of the determination in steps 110 to 116 is ensured. If it is determined that the number of repetitions n ⁇ 3, the process returns to step 104, the signal strength I a, I r is measured. If it is determined that the number of repetitions n ⁇ 3, the three-way valve 40 is controlled to be closed (step 140). Thereby, pH adjustment is complete
- signal strengths I a0 and I r0 are calculated using a signal strength map indicating the correlation between pH and signal strength I
- a target value R 0 of the signal strength ratio is calculated from the signal strengths I a0 and I r0.
- the target value R 0 may be directly calculated using a signal intensity ratio map indicating the correlation between pH and signal intensity ratio R.
- the signal intensity ratio map can be created by obtaining the correlation between pH and signal intensity ratio R, as in the signal intensity map.
- setting the range of the arrival rate f i as indicated by step 112, 114, 116 in three steps may be set to four or more stages.
- step 124 and 126 and short waiting time as arriving ratio f i approaches 1.00 less injection amount enough aqueous ammonia pH of the sample 12 to approach the target pH it can. Therefore, the pH of the sample 12 can be adjusted to the target pH.
- test sample 0.5 ml of methyl red indicator (0.1%) and acetic acid (99%) were added to 50 ml of a 0.7% nitric acid solution, and the pH was adjusted using aqueous ammonia (28%).
- Specific wavelength lambda a is 550 nm
- reference wavelength lambda r was 650 nm.
- the signal intensity of the light of a particular wavelength lambda a and the reference wavelength lambda r is changed at the same time, changing the installation position of the container 14 could stably pH adjustment.
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Abstract
Description
pHに応じて変色するpH指示薬が添加された液体サンプルを収容した容器と、
pH調整液としてのアンモニア水または炭酸水を貯留する調整液ボトルと、
前記容器内のサンプル液面に対向配置された噴射口を備え、キャリアガスによって霧化した前記調整液ボトル内のpH調整液を当該噴射口から噴射する噴霧器と、
前記噴霧器と前記調整液ボトルの間に配置され、前記噴霧器と前記調整液ボトルを連通して前記噴射口からpH調整液を噴射する液噴射状態と、前記噴霧器と外気を連通して前記噴射口から空気を噴射する空気噴射状態とを切り替える多方弁と、
前記容器の外部から照射され前記容器を透過した光の強度を検出する検出装置と、
前記検出装置において検出される光の強度に基づいて前記多方弁の連通状態を切り替える制御装置と、
を備えることを特徴とする。
前記検出装置は、前記サンプルが目標pHに調整された場合に前記pH指示薬に吸収される特定波長の光の強度と、前記pH指示薬に吸収されない参照波長の光の強度とを検出可能に構成され、
前記制御装置は、前記検出装置において検出される前記特定波長および前記参照波長の光の強度から強度比を算出し、前記目標pHに応じて設定される目標強度比と当該算出強度比を比較することで前記多方弁の連通状態を切り替えるように構成されていることを特徴とする。
前記制御装置は、前記目標強度比に対する前記算出強度比の割合が1を含む所定範囲内にある場合、当該割合が1に近づくほど前記液噴射状態とする期間を短くするように構成されていることを特徴とする。
図1は、本実施形態のpH自動調整装置の構成を示す概略図である。本実施形態のpH自動調整装置10は、pH指示薬(メチルイエロー、メチルオレンジまたはメチルレッド)を添加した液体サンプル12のpHを自動的に調整するための装置である。図1に示すように、pH自動調整装置10は、サンプル12を収容可能な四角形状の本体部14aと、サンプル12を出し入れするための開口部14bとから構成される容器14を備えている。容器14はポリプロピレン製の透明容器である。但し、後述する特定波長λaおよび参照波長λrの光の両者に対して高い透過性を示すものであれば、容器14の材料は特に限定されない。
上述したように、pH調整液としてのアンモニア水を噴霧器から噴射しようとすると、噴霧器内にアンモニアの気泡が生じてしまう。そこで、本実施形態においては、到達割合fに応じて三方弁40を操作する制御を実行することとしている。到達割合fiは、信号強度比の目標値R0に対する信号強度比の現在値Riの割合として表される。現在値Riは、参照波長の信号強度Irに対する特定波長の信号強度Iaの割合として表される。
また、本実施形態においてはpHと信号強度Iの相関を示す信号強度マップを用いて信号強度Ia0,Ir0を算出し、この信号強度Ia0,Ir0から信号強度比の目標値R0を算出したが、pHと信号強度比Rの相関を示す信号強度比マップを用いて目標値R0を直接的に算出してよい。なお、信号強度比マップは、信号強度マップ同様、pHと信号強度比Rの相関関係を得ることにより作成できる。
また、本実施形態においては、ステップ112,114,116に示したように到達割合fiの範囲を3段階に設定したが、4段階以上に設定してもよい。この場合においても、ステップ124,126に示したように、到達割合fiが1.00に近づくほど待ち時間を短くすれば、サンプル12のpHが目標pHに近づくほどアンモニア水の噴射量を少なくできる。従って、サンプル12のpHを目標pHに合わせ込むことができる。
次に、実験例を参照しながら、本実施形態のpH自動調整装置について更に説明する。
テスト試料:0.7%硝酸溶液50ml中に、メチルレッド指示薬(0.1%)および酢酸(99%)0.5mlを添加し、アンモニア水(28%)を用いてpH調整を行った。特定波長λaは550nm、参照波長λrは650nmとした。
結果:特定波長λaおよび参照波長λrの光の信号強度は同時に変化するので、容器14の設置位置を変えても安定的にpH調整ができた。調整目標pH=6.0としてpH調整を行ったところ、8個の独立したテスト試料のうち、pH=5.9となったものが1個、pH=6.0となったものが5個、pH=6.1となったものが2個であった。各テスト試料の調整は5分以内に完了できた。
この結果から、固相抽出における微量元素の回収率の再現性を確保するのに十分な精度でpH調整できることが確認された。
12 サンプル
14 容器
20 光源
26 分光器
28 ネブライザ
28a 噴射口
36 アンモニア水
38 調整液ボトル
40 三方弁
42 PC
44 透過光信号
48 開閉信号
Claims (3)
- pHに応じて変色するpH指示薬が添加された液体サンプルを収容した容器と、
pH調整液としてのアンモニア水または炭酸水を貯留する調整液ボトルと、
前記容器内のサンプル液面に対向配置された噴射口を備え、キャリアガスによって霧化した前記調整液ボトル内のpH調整液を当該噴射口から噴射する噴霧器と、
前記噴霧器と前記調整液ボトルの間に配置され、前記噴霧器と前記調整液ボトルを連通して前記噴射口からpH調整液を噴射する液噴射状態と、前記噴霧器と外気を連通して前記噴射口から空気を噴射する空気噴射状態とを切り替える多方弁と、
前記容器の外部から照射され前記容器を透過した光の強度を検出する検出装置と、
前記検出装置において検出される光の強度に基づいて前記多方弁の連通状態を切り替える制御装置と、
を備えることを特徴とするpH自動調整装置。 - 前記検出装置は、前記サンプルが目標pHに調整された場合に前記pH指示薬に吸収される特定波長の光の強度と、前記pH指示薬に吸収されない参照波長の光の強度とを検出可能に構成され、
前記制御装置は、前記検出装置において検出される前記特定波長および前記参照波長の光の強度から強度比を算出し、前記目標pHに応じて設定される目標強度比と当該算出強度比を比較することで前記多方弁の連通状態を切り替えるように構成されていることを特徴とする請求項1に記載のpH自動調整装置。 - 前記制御装置は、前記目標強度比に対する前記算出強度比の割合が1を含む所定範囲内にある場合、当該割合が1に近づくほど前記液噴射状態とする期間を短くするように構成されていることを特徴とする請求項2に記載のpH自動調整装置。
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KR1020167008030A KR101897373B1 (ko) | 2013-08-30 | 2014-07-15 | pH 자동 조정 장치 |
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CN105492987A (zh) | 2016-04-13 |
JP6143349B2 (ja) | 2017-06-07 |
CN105492987B (zh) | 2017-03-01 |
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KR101897373B1 (ko) | 2018-09-11 |
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