TWI449896B - 測量低鹼度溶液之pH值的方法及裝置 - Google Patents
測量低鹼度溶液之pH值的方法及裝置 Download PDFInfo
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Description
本發明大體上係關於一種測量pH值的系統,且更特別地關於一種測量低鹼度溶液之pH值的改良方法及裝置,其係藉由從複數個pH指示劑感測器來外推分光光度計測量值。
有廣多種系統及方法業經用於水系統的pH測量中。例如,玻璃電極即常用在實驗室和工業環境中來測量pH值。或者,分光光度測定技術也已知可用於pH測量。pH測量用的範例系統和方法也經載於2006年8月22日提出申請的美國專利申請序號第11/507,689號中,其揭示內容以引用方式併入本文。
儘管先前技藝裝置和系統已提供有用的產品,但在以相當簡單及使用者友善方式提供一種快速、簡單、且準確的低鹼度樣品溶液的測量上,彼等都尚未完全令人滿意。和測量低鹼度溶液的pH值有關的挑戰之一是,在樣品溶液中導入指示劑所引起的pH值擾亂無法忽視者。此係真確者,因為指示劑本身即為弱酸或弱鹼之故。換另一方式說,因為導入樣品中的指示劑濃度的量相對於溶液中的酸或鹼之量係明顯者,因而弱緩衝溶液(例如低鹼度者)的pH值會被嚴重地擾亂。
先前技藝業經嘗試降低或矯正指示劑在水相中引起的
擾亂,其藉由:(1)將指示劑儲液的pH值調整至接近樣品的pH;(2)減少指示劑添加至樣品的比例;及(3)透過逐步的指示劑添加觀察指示劑所誘發的擾亂,然後採用線性外推法來取得樣品的pH值。此等先前技藝方法也許可以提供有用的結果,但彼等卻典型地非常耗時且也不具使用者友善性。因此,一種可以以相當具有成本效益且以使用者友善方式來提供確切、準確、且快速的低鹼度樣品pH測量之改善方法及系統之強烈需求仍存在著。
和測量低鹼度溶液的pH值有關的挑戰之一是在樣品溶液中導入指示劑所引起的對pH值之擾亂為無法忽視者。因此,pH值測量可能因導到弱緩衝溶液(即低鹼度溶液)中的指示劑濃度而受到嚴重地擾亂。為了應付此一挑戰,本發明揭示包含一種含有複數種pH指示劑的感測器陣列之系統及方法,每一指示劑各具不同的指示劑濃度。感測器陣列係藉由應用感測器陣列於具有已知pH值的樣品溶液來校準。同時記錄來自每一指示劑的回應值,且產生一校準函數(即校準曲線),其表出每一指示劑濃度相對於指示劑濃度之pH回應值。一經校準後,即可將感測器陣列應用於具有未知pH的低鹼度樣品溶液。然後將得自每一pH指示劑的pH值與校準函數相比對,且產生表出來自每一指示劑濃度的pH回應值之配合函數(如配合方程式)。隨即產生配合方程式並外推來測定交截點(即
當指示劑濃度為0時)以取得未知樣品的原始(即實際)pH值。
本發明另一方面係關於此等系統和方法的用途,及測量低鹼度溶液的pH值之示範方法。本發明的其他方面及其優於先前技術的特點可從參照所附圖式來閱讀下面的詳細說明和後附的申請專利範圍,而獲得明瞭。
本發明描述一種為迅速和準確地測量低鹼度溶液,如低鹼水樣的pH值之含以聚合物膜為基礎的感測器陣列之系統及方法。眾所皆知者,鹼度或緩衝容量是水樣的基本特性之一。鹼性是一種溶液中和酸的能力之量度。較低鹼度意味當酸加進溶液中時,較低的抗pH值變化之能力。
本發明的概念係建基於在低鹼度溶液中,在樣品中導入指示劑所引起對pH值的擾亂是無法忽視之認知。此為真確者,因為指示劑本身即為弱酸或弱鹼之故。因此,溶液的pH值會因為導入樣品中的指示劑濃度之量相對於在弱緩衝(即低鹼度)溶液中所含的酸或鹼分量為明顯者之事實而被嚴重地擾亂。此擾亂效應在pH指示劑載膜上更加明顯。
為了應付此一挑戰,本發明的一方面述及一種為迅速且準確測量低鹼度樣品的pH值之外推方法。此方法較佳地利用,但不限於,一種依據先前以引文方式併入本文中
的美國專利申請序號第11/507,689號建構的感測器陣列。此感測器陣列係經建構以包含複數個指示劑部分,各具不同的指示劑濃度。建構好後,使用該感測器陣列以分光光度法測量樣品之pH值,藉此同時使每一指示劑提供離散吸光度pH值測量值。將從每一指示劑部分測量到的pH值相對於彼等的個別指示劑濃度標繪,且外推出表出所測量的pH值之配合函數(即配合方程式)以測定當指示劑濃度為0時的交截點而取得樣品的初始pH值(即pH實值)。本發明之系統及方法提供超過已知方法的優點,因為取代降低因指示劑的添加所引起的pH值擾亂者,本發明利用來自不同指示劑濃度的pH值擾亂之間的關係來校準感測器陣列,如此可為從具有未知pH值的低鹼度樣品測定pH值提供一種基線參考參數。
如本文所揭示者,本發明之系統及方法特別適合於快速且準確地測定低鹼度溶液的pH值。因為在溶液中添加弱酸或弱鹼指示劑所引起的擾亂,特別是當指示劑濃度(其典型地為弱酸或弱鹼)相對於在樣品溶液中的酸或鹼之量為顯著之時者,測量低鹼度溶液的pH值不適瑣細者。pH值回應可以用比色計、分光光度計、或螢光分光計來測量。
依據本發明示範性具體實例,一pH感測器陣列可用4膜陣列來構成,不過要理解者,可以使用或多或少的膜而不違離本發明的範圍。每一感測器膜包含不同的pH指示劑濃度,分別以In1
、In2
、In3
及In4
表出。針對本發明
實施例之目的,每一膜的指示劑濃度範圍係從約0.01到10%。
固體膜典型地是以水溶性聚合物、醋酸纖維素、或聚甲基丙烯酸2-羥基乙酯(pHEMA)製備成。指示劑可為比色pH指示劑、螢光pH指示劑、或在技藝中已知或後來會發展出的其它合適pH指示劑。比色pH指示劑較佳地選自下列所組成的群組:酚紅、甲酚紅、間-甲酚紫、百里酚藍、溴氯酚藍W.S.、溴甲酚綠、氯酚紅、溴甲酚紫、溴百里酚藍、中性紅、酚酞、鄰-甲酚酞、耐爾藍A(nile blue A)、百里酚酞、溴酚藍、間-甲酚紫、孔雀石綠、燦爛綠、結晶紫、甲基綠、甲基紫2B、苦味酸、萘酚黃S、間胺黃、鹼性品紅、玫瑰紅B、甲基黃、甲基橙、茜素。
為了證實本發明的概念,吾等乃進行對於低鹼度溶液因為添加不同量指示劑到樣品溶液中所導致的pH值變化(即,擾亂)之理論計算。儘管於本文所揭示的實施例係經涵蓋用來展示本發明的廣泛適用性,不過熟諳此技藝者仍應理解者在此等實施例中揭示的技術係代表本案發明人所發現的技術,且因此可視為係構成其實用的示範性模式。無論如何,熟諳此技藝者從本揭示著眼,應該領會到在所揭示的特定實施例中做出許多改變,且仍可取得相同或相似的結果而不違離本發明的範圍。此外,本文所揭示的校準和外推方法可用以比色計、分光光度計、或螢光分光計所測得的pH值來測定低鹼度樣品中的pH值。
如圖1所示,圖解說明顯示出在將不同量的百里酚藍
添加在溶液中之後,如何實現pH值的變化。圖1的結果指出隨著在溶液中添加的指示劑濃度之增加,Δ pH(即實際pH值-測量的pH值)會變得愈來愈大。此結果清楚地闡釋弱緩衝(即,低鹼度)溶液會被指示劑添加所嚴重地擾亂。
繼續參照圖1,pH值擾亂的理論性計算證明鹼度愈低,Δ pH愈大。因此,我們可以判定隨著指示劑的愈多添加,以及隨著愈低的鹼度,溶液的pH值被改變或擾亂會愈大。
為了證明此結論,吾等進行第一個實驗,其中提供一系列的100 ppm的碳酸鹽緩衝液,且在指示劑的添加之前與之後測量不同溶液的pH值。來自此第一實驗的結果經顯示於圖2中。如圖2所示,一系列的標繪圖闡示出在指示劑的添加之前與之後不同溶液的pH值之測定。基於此等結果,明顯地,當20 ppm的酚紅(酸形式)加進溶液中時,pH測量值會稍微地減低。圖2也示出隨著酚紅的量從0 ppm(菱形點)增加到100 ppm(方形點),可觀察到pH值的逐步降低。在添加進愈多的酚紅100 ppm時,pH值就會受到大幅地擾亂。如圖2所示,在加入100 ppm的酚紅之下,pH值超過8.0的溶液基本上會變得不能區別。基於此等結果,明顯地可以考慮對經由指示劑添加所引起的Δ pH之矯正以取得溶液的確實pH值(實際pH)。
據此,吾等乃進行第二實驗已證明外推方法可用來測
定pH值。在使第二實驗中,選擇2個原始pH值各為8.12及8.53的100 ppm碳酸鹽緩衝液。使用pH回應值範圍從約6.8到8.2的酚紅指示劑。在將酸形式的酚紅逐步添加進弱緩衝碳酸鹽溶液時,使用pH計來監測該溶液的pH值。
如圖3所示,對每一100 ppm碳酸鹽緩衝液標繪出100 ppm指示劑添加所測得的pH測之線性關係。將從每一指示劑類型所得表出所測pH值之線性函數外推到當指示劑百分比為0時以取得交截點。如圖3所示,交截點,即8.13及8.46,代表當指示劑濃度為0時溶液的pH值。以此方式,交截點代表在指示劑添加前溶液的原始pH值。可以輕易明白者,交截點非常接近碳酸鹽緩衝液的初始pH值,即分別為8.12及8.53。因此,吾等的實驗證明當鹼度非常低時,因為指示劑狀況所致pH值的擾亂係無法忽視者。再者,吾等的實驗也證明本發明的示範性線性外推技術頗可用於取得樣品的原始pH值。下面要更詳細地說明在示範性外推技術中所用之演算。
為了矯正因指示劑添加所引起pH值變化,使用有足夠高鹼度的合成冷卻標準溶液相對於有一系列指示劑濃度的固體pH感測器來建立校準函數。在此第三實驗中,用相同的固體pH感測器來測量樣品的pH值,且計算每一指示劑濃度所測得的pH值。然後,相對於指示劑濃度標繪所測pH值,且產生外推配合方程式並外推出到指示劑濃度為0時以取得未知樣品的初始pH值(即,實際pH)
。
如圖4所示,對4種指示劑濃度(0.5%、1.0%、1.5%、2.0%)產生校準函數。測量出具有低鹼度(低於100 ppm)的未知樣品之pH值。
圖5為闡釋從本發明一示範性線性外推方法中取得的結果之圖解。如從圖5中可看出者,該方程式的交截點(即,當指示劑濃度為0時)為9.18。由於交截點係代表在指示劑添加前的pH值,因此吾等的外推方法證明9.18的交截點非常好的近似於用pH計測得的9.07之實際pH值。
為了達到圖4和5中所闡釋的結果,乃用4膜陣列來建構一pH感測器陣列,其中每一感測器膜含有不同指示劑濃度,分別為In1
、In2
、In3
及In4
。下一步,從一系列具有確定且已知鹼度值的pH標準溶液測量每一pH感測器膜的吸光度回應值。
接著,從上述第二步驟測得的數據產生對每一pH感測器膜的校準曲線。下面顯示出為計算目的所用的以f1
、f2
、f3
、及f4
表出的校準函數。
接下來,應用一未知pH值樣品在pH感測器陣列上,且從每一膜測量吸光度值。為了下面所示計算目的,分別對膜1、2、3和4將此等吸光度值表為A1
、A2
、A3
、及A4
。
再來,從每一相應的校準方程式和吸光度值計算每一膜的初步pH值。例如,膜1-4的pH分別表為:pH1
=
f1
(A1
)、pH2
=f2
(A2
)、pH3
=f3
(A3
)、及pH4
=f4
(A4
)。要提及者若未知樣品的鹼度值等於校準標準溶液的鹼度值,則此等pH值全部都會一樣。然而,若未知樣品的鹼度值不等於校準標準溶液的鹼度值,則pH1
、pH2
、pH3
、及pH4
全部都會具有不同的值。
在最後步驟中,依據下面所給外推演算法,從初步pH值pH1
、pH2
、pH3
、及pH4
計算出未知樣品的實際pH值。
其中:i為膜之指數;Ini
表示在第i膜中的指示劑濃度;pHi
為從第i膜的吸光度和其相應校準方程式fi
計算出的表觀pH值;且N為pH膜的數目。
圖5為示範性外推演算法的圖解說明。下面顯示出圖5所示結果的計算及其相應的數學程序:方程式2:N=4、i=1、2、3、和4
方程式3:
Σ (Ini
)2
=2.02+1.52+1.02+0.52=7.5
方程式4:ΣpHi
=8.38+8.60+8.75+9.00=34.73
方程式5:ΣIni
=2.0+1.5+1.0+0.5=5.0
方程式6:ΣIni
.pHi
=2.0×8.38+1.5×8.60+1.0×8.75+0.5×9.00=42.91
方程式7:pH樣品=(34.73×7.5-5.0×42.9)(7.5×4-5.0×5.0)=9.18
依據上述結果,本發明因此藉由提供一種具有複數種指示劑濃度的感測器陣列,及從已知樣品產生的校準函數校準未知樣品的pH測定值,以取得未知樣品的pH值,來提供一種直接測量低鹼度樣品的pH值之系統。根據本發明,及時地同時記錄此等測量值以避免涉及逐步指示劑添加的繁瑣及冗長之測量和計算。作為一實施例,本發明一示範性固體膜感測器證明對於目標的快速回應,對於原地(in situ)(現場)測試可在約五分鐘內取得結果。
如本文所述者,本發明的系統及方法係組入一種以固體聚合物為基礎的pH感測器膜陣列,其包含一系列不同的指示劑濃度。一經建構好,即可將該感測器陣列應用於包含已知pH值及鹼度的樣品溶液。同步測量和記錄每一指示劑濃度的pH回應值。接著,藉由標繪所測pH值相對於每一指示劑濃度來產生校準函數(即,校準曲線)。
此校準曲線因此代表pH測定值相對於指示劑濃度的標繪圖。接下來,產生表出每一pH測量值的配合函數(即,配合方程式)。將該配合方程式外推以測定當指示劑濃度為0時之交截點,如此得到在添加指示劑前的樣品原始pH值的準確讀數。以此方法,校準曲線代表基線參考函數,其可用來校準每一指示劑部分的個別結果以快速且容易地消除來自不同指示劑添加的pH擾亂,以外推出低鹼度樣品的pH值。
雖然以於典型的示範性具體實例中闡明且描述本揭示,不過其不是打算將本發明限制於所示細節中,因為可做出各種修改及取代而不以任何方式違離本發現的範圍及旨意。如此,熟諳此技者可使用不超過例行性的實驗,就可以做出針對本文所揭示的揭示內容之其他修改及等效物,且所有此等修改及等效物均經視為在下面申請專利範圍中所界定的揭示內容之範圍內。
圖1為顯示在導入不同量的百里酚藍之後的pH值變化之圖解實例;圖2繪示出一系列標繪圖,顯示出在指示劑添加之前與之後,不同溶液的pH值;圖3為一圖形,示出pH測量值相對於酚紅的添加量之關係;圖4顯示出在四種不同指示劑濃度下產生的校準曲線
;及圖5為一圖形,顯示出從本發明示範線性外推法取得的結果。
Claims (20)
- 一種測量pH值之方法,其包含下列步驟:提供一pH感測器陣列,其具有複數pH指示劑,各該指示劑具有不同的指示劑濃度;將該感測器陣列應用於具有已知pH值的樣品溶液;同時測量來自各該指示劑的第一pH回應值;產生表出該第一pH回應值的校準函數;將該感測器陣列施用於具有未知pH值的低鹼度樣品溶液;同時測量來自各該指示劑的第二pH回應值;將該第二pH回應值與該校準函數比對以自各該指示劑取得初步pH值;產生表出該初步pH值的配合函數;及將該配合函數外推到指示劑濃度為0時以估測該未知樣品的實際pH值。
- 如申請專利範圍第1項之方法,其中該外推步驟包括產生該配合函數的線性交截點以取得該未知樣品的pH值。
- 如申請專利範圍第2項之方法,其中該外推步驟包括以如下方程式定出的外推演算法:
- 如申請專利範圍第3項之方法,其中該指示劑為以固體聚合物為基礎,包含pH指示劑的膜。
- 如申請專利範圍第4項之方法,其中該指示劑為比色pH指示劑或螢光pH指示劑。
- 如申請專利範圍第5項之方法,其中該比色pH指示劑係選自酚紅、甲酚紅、間-甲酚紫、百里酚藍、溴氯酚藍W.S.、溴甲酚綠、氯酚紅、溴甲酚紫、溴百里酚藍、中性紅、酚酞、鄰-甲酚酞、耐爾藍A(nile blue A)、百里酚酞、溴酚藍、間-甲酚紫、孔雀石綠、燦爛綠、結晶紫、甲基綠、甲基紫2B、苦味酸、萘酚黃S、間胺黃、鹼性品紅、玫瑰紅B、甲基黃、甲基橙、茜素所組成的群組。
- 如申請專利範圍第1項之方法,其中該pH回應值是以比色計、分光光度計、和螢光分光計測量。
- 如申請專利範圍第4項之方法,其中該固體膜係從水溶性聚合物製成者。
- 如申請專利範圍第4項之方法,其中該固體膜係從聚甲基丙烯酸2-羥基乙酯(pHEMA)或醋酸纖維素製成的。
- 如申請專利範圍第4項之方法,其中該感測器陣列包括至少4種pH指示劑,具約0.01%到10%之濃度。
- 如申請專利範圍第3項之方法,其進一步包括產生該校準及配合函數的圖形表現之步驟。
- 一種測量pH值用之系統,其包括:一pH感測器陣列,其具有複數pH指示劑,各該指示劑具有不同的指示劑濃度;用以施用該感測器陣列於具有已知pH值的樣品溶液之機構;用以同時測量來自各該指示劑的第一pH回應值之機構;用以產生表出該第一pH回應值的校準函數之機構;用以將該感測器陣列施用於具有未知pH值的低鹼度樣品溶液之機構;用以同時測量來自各該指示劑的第二pH回應值之機構;用以比較該第二pH回應值與該校準函數以自各該指示劑取得初步pH值之機構;用以產生表出該初步pH值的配合函數之機構;及用以將該配合函數外推到指示劑濃度為0之時以估計該未知樣品的實際pH值之機構。
- 如申請專利範圍第12項之系統,其中該用於外推的機構包括用於產生該配合函數的線性交截點以取得該未知樣品的pH值之機構。
- 如申請專利範圍第13項之系統,其中該用於外推的機構包括由下面方程式所定的外推演算法:
- 如申請專利範圍第14項之系統,其中該指示劑為含有以固體聚合物為基礎的pH指示劑之膜。
- 如申請專利範圍第15項之系統,其中該指示劑為比色pH指示劑或螢光pH指示劑。
- 如申請專利範圍第16項之系統,其中該比色pH指示劑係選自酚紅、甲酚紅、間-甲酚紫、百里酚藍、溴氯酚藍W.S.、溴甲酚綠、氯酚紅、溴甲酚紫、溴百里酚藍、中性紅、酚酞、鄰-甲酚酞、耐爾藍A(nile blue A)、百里酚酞、溴酚藍、間-甲酚紫、孔雀石綠、燦爛綠、結晶紫、甲基綠、甲基紫2B、苦味酸、萘酚黃S、間胺黃、鹼性品紅、玫瑰紅B、甲基黃、甲基橙、茜素所組成的群 組。
- 如申請專利範圍第15項之系統,其中該固體膜係從水溶性聚合物、聚甲基丙烯酸2-羥基乙酯(pHEMA)或醋酸纖維素製備的。
- 如申請專利範圍第15項之系統,其中該感測器陣列包含至少4種pH指示劑,具有0.01%到10%之濃度。
- 如申請專利範圍第14項之系統,其進一步包括用以產生該校準及配合函數的圖形表現之機構。
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US7883898B2 (en) | 2011-02-08 |
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JP5221646B2 (ja) | 2013-06-26 |
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AU2008247975A1 (en) | 2008-11-13 |
KR101462295B1 (ko) | 2014-11-14 |
US20110091985A1 (en) | 2011-04-21 |
MY151097A (en) | 2014-04-15 |
JP2010527001A (ja) | 2010-08-05 |
US20110217213A1 (en) | 2011-09-08 |
TW200912285A (en) | 2009-03-16 |
EP2145174B1 (en) | 2019-02-13 |
NZ580942A (en) | 2011-05-27 |
KR20100016248A (ko) | 2010-02-12 |
HK1142132A1 (en) | 2010-11-26 |
RU2456578C2 (ru) | 2012-07-20 |
RU2009145112A (ru) | 2011-06-20 |
CL2008001286A1 (es) | 2008-12-26 |
EP2145174A1 (en) | 2010-01-20 |
WO2008137260A1 (en) | 2008-11-13 |
CN101675331A (zh) | 2010-03-17 |
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