Inhoudsopgave
Inzicht in de relatie tussen geleidbaarheid en totaal opgeloste vaste stoffen (TDS) in waterkwaliteitsanalyse
Geleidbaarheid en totaal opgeloste vaste stoffen (TDS) zijn twee fundamentele parameters bij de analyse van de waterkwaliteit. Het begrijpen van de relatie tussen deze twee factoren is van cruciaal belang voor iedereen die betrokken is bij waterbehandeling, milieumonitoring of industriële processen waarbij waterverbruik betrokken is.
Geleidbaarheid verwijst in de context van waterkwaliteit naar het vermogen van water om elektrische stroom te geleiden. Deze eigenschap houdt rechtstreeks verband met de concentratie van ionen in het water, die afkomstig zijn van opgeloste zouten en anorganische materialen zoals Alkaliën, chloriden, sulfaten en bicarbonaten. Hoe hoger de ionenconcentratie, hoe groter de geleidbaarheid. Het is belangrijk op te merken dat zuiver water een slechte geleider van elektriciteit is. Wanneer stoffen echter in water oplossen, worden ze afgebroken tot ionen, die een elektrische lading kunnen dragen, waardoor de geleidbaarheid van het water toeneemt.
Aan de andere kant is Total Dissolved Solids (TDS) een maatstaf voor het gecombineerde gehalte aan alle anorganische en organische stoffen in een vloeistof. Dit omvat alles wat in water aanwezig is, behalve de zuivere watermoleculen en zwevende vaste stoffen. TDS kan een breed scala aan stoffen omvatten, zoals mineralen, zouten, metalen, kationen of anionen opgelost in water. Het wordt gemeten in milligram per volume-eenheid water (mg/L), ook wel parts per million (ppm) genoemd.
| pH/ORP-3500 serie pH/ORP online meter | |||
| \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\ | pH | ORP | Temp. |
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| Resolutie | 0.01 | 1mV | 0.1\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\℃ |
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| Bufferoplossing | 9.18\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\；6.86\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\；4.01\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\；10.00\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\；7.00\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\；4.00 | ||
| Gemiddelde temperatuur | (0\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\～50)\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\℃\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\（met 25\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\℃\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ standaard \\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\）handmatig / automatisch temperatuurcompensatie voor selectie | ||
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| Verbruik | <3W | ||
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| Afmeting | 48 mm\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\×96mm\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\×80mm (H\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\×W\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\×D) | ||
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| Installatie | Panelgemonteerd, snelle installatie | ||
De relatie tussen geleidbaarheid en TDS is vrij eenvoudig. Naarmate de hoeveelheid opgeloste vaste stoffen in water toeneemt, neemt ook het vermogen om elektriciteit te geleiden toe. Daarom komt een hoge TDS-waarde doorgaans overeen met een hoge geleidbaarheid. Het is echter belangrijk op te merken dat niet alle opgeloste vaste stoffen in gelijke mate bijdragen aan de geleidbaarheid. Sommige ionen, zoals natrium en chloride, zijn zeer geleidend, terwijl andere, zoals silica en organische verbindingen, zeer weinig bijdragen aan de geleidbaarheid.
In praktische termen betekent dit dat hoewel geleidbaarheid een snelle en gemakkelijke schatting kan geven van de totale hoeveelheid opgeloste vaste stoffen in water, deze niet altijd geheel accuraat hoeft te zijn. Als het water bijvoorbeeld een hoge concentratie stoffen bevat die niet veel bijdragen aan de geleidbaarheid, kan de TDS hoger zijn dan wat de geleidbaarheidsmeting zou suggereren. Omgekeerd, als het water veel sterk geleidende ionen bevat, kan de geleidbaarheid hoog zijn, zelfs als de TDS relatief laag is.
Ondanks deze potentiële discrepanties wordt geleidbaarheid in veel toepassingen nog steeds veel gebruikt als proxy voor TDS. Dit komt omdat geleidbaarheid snel en eenvoudig kan worden gemeten met een eenvoudige sonde, terwijl het direct meten van TDS vaak complexere en tijdrovende laboratoriummethoden vereist.
Concluderend zijn geleidbaarheid en TDS nauw verwante, maar niet identieke metingen van de waterkwaliteit. Beide bieden waardevolle informatie over de hoeveelheid en het type opgeloste stoffen in water, maar ze hebben elk hun sterke punten en beperkingen. Inzicht in de relatie tussen deze twee parameters kan waterprofessionals helpen beter geïnformeerde beslissingen te nemen over waterbehandeling en -monitoring. Het is een complex samenspel van factoren, maar wel één die cruciaal is voor het behoud van de veiligheid en kwaliteit van onze watervoorzieningen.
