Kutheni iiSensors ze-ISE ze-Nitrate zeXesha langempela zithatha indawo yeSampuli yokuBamba yekota kwiindawo zoKhuseleko lwamanzi angaphantsi komhlaba eYurophu

Nantsi inyani yokusebenza kokuthatha isampuli yamanzi angaphantsi komhlaba rhoqo ngekota. Ingcali evela kwibhodi yamanzi ifika emthonjeni wokubeka iliso nge-15 kaMatshi, yehlisa umqokeleli wesampulu, iqokelele isampuli engama-500-milliliter, ize iyithumele kwilebhu eqinisekisiweyo. Ingxelo yelebhu ifika nge-22 kaMatshi. Uxinzelelo lwe-nitrate kuloo mthonjeni, ngaloo mini inye kaMatshi, yayiyi-48 mg/L — 2 mg/L ngaphantsi komda we-EU Nitrates Directive we-50 mg/L. Ingxelo yekota ifakiwe. Indawo yomthombo iyaqhubeka nokusebenza.

Oko ingxelo ingakubambiyo: isiganeko semvula enkulu ngoMatshi 19 sakhupha i-nitrogen esuka kwintsimi yombona esandul’ ukuchumiswa yaya kwi-aquifer enganzulu. Ngomhla wama-24 kuMatshi, uxinaniso lwe-nitrate kuloo mthombo wokujonga wawuyi-71 mg/L. Isampulu elandelayo yekota icwangciselwe umhla we-15 kuJuni. Kangangeentsuku ezingama-83, amanzi okusela ane-nitrate engaphezulu komda osemthethweni akhutshwa, anyangwa, kwaye asasazwa kumakhaya. Akukho mntu wayesazi. Inkqubo yokuvavanya isampuli yekota, ehambelana ngokugqibeleleyo neemfuno zokujonga ezisemthethweni, yabamba inqaku ledatha elinye eliye lawela phakathi kohambo olubini.

I-Sensor: Oko Kuthethwa "yi-Ion-Selective Electrode" Kumanzi Angaphantsi Komhlaba

I-ISE nitrate sensor ayilinganisi i-nitrate ngokubonakalayo. Ayisebenzisi ukufunxwa kwe-UV ngendlela esenza ngayo i-COD sensor yamanzi angaphezulu. Isebenzisa i-polymer membrane ene-ionophore - imolekyuli ebopha ngokukhetha ii-nitrate ion - ukuvelisa amandla ombane ahambelana nomsebenzi we-nitrate emanzini angqongileyo. Loo voltage, ilinganiswa ngokuchasene ne-electrode yesalathiso kwaye ihlawulelwa ubushushu, iguqulwa ibe yi-concentration reading kwi-mg/L nge-Nernst equation.

Ukukhetha kubalulekile kuba amanzi angaphantsi komhlaba ayisosisombululo se-nitrate esicocekileyo. Iqulethe i-chloride, i-bicarbonate, i-sulfate, kunye ne-organic carbon enyibilikisiweyo, zonke ezi zinto zinokuphazamisana nomlinganiselo ukuba i-membrane ayikhethi ngokwaneleyo. I-membrane ye-sensor ye-Honde ine-nitrate selectivity emalunga ne-0.001 ngokuchasene ne-chloride - oko kuthetha ukuba iphendula ngokuphindwe kayi-1,000 ngamandla kwi-nitrate kune-chloride kumanqanaba alinganayo. Kumanzi angaphantsi komhlaba aseDutch, apho amazinga e-chloride kwi-sandy aquifers ahlala ephakathi kwama-20 ukuya kuma-80 mg/L, oku kuthetha ukuba ukuphazamiseka kwe-chloride kunegalelo elingaphantsi kwe-0.1 mg/L ye-nitrate ebonakalayo - ayinamsebenzi xa kuthelekiswa nomlinganiselo wolawulo we-50 mg/L.

I-RS485 Modbus-RTU digital output isusa ukuwohloka kwesignali ye-analog kwiimitha ezingama-30 ukuya kwezili-100 zentambo phakathi kwe-sensor engaphantsi komhlaba yomthombo wokubeka iliso kunye ne-datalogger ye-wellhead. Kwi-analog 4-20mA loop eqhuba i-80 yeemitha zentambo kwi-wet well casing, i-signal inokutyibilika nge-2-3% ngenxa yokuphazamiseka kwe-ground-loop kunye nokungena komswakama kwi-junction box. I-Digital RS485 yahlukile — ilinganisa umahluko we-voltage phakathi kwee-signal wires ezimbini, kunye ne-common-mode ingxolo erhoxiswayo. Ukufundwa kwe-wellhead kufana nokufundwa kwe-sensor.

Ukulungiswa kobushushu ngokuzenzekelayo kwakhelwe kwintloko yesenzwa. Ubushushu bamanzi angaphantsi komhlaba kwi-Dutch shallow aquifers buyahluka ngokwexesha lonyaka ukusuka kwi-8°C ngoMatshi ukuya kwi-14°C ngoSeptemba. I-Nernst equation ibandakanya i-slope factor exhomekeke kubushushu evelisa impazamo ye-2% nge-degree Celsius ukuba ayihlawulwanga. I-thermistor edibeneyo ilungisa oku ngexesha langempela.

Kutheni iNetherlands, Kutheni Ngoku

INetherlands isebenza phantsi koMthetho weNitrates derogation — imvume ekhethekileyo yokufaka umgquba wemfuyo omninzi ngehektare kunomda oqhelekileyo we-EU we-170 kg nitrogen ngehektare ngonyaka — ngenxa yokulima kwengca okunesivuno esiphezulu kweli lizwe. Ukwaphulwa komthetho kwavuselelwa, kwaza kwaqiniswa, kwaye ileta yeKhomishini yaseYurophu kaDisemba 2025 eya kuMphathiswa wezoLimo waseDatshi uFemke Wiersma yakhankanya ngokucacileyo imfuneko “yokujonga ngcono” i-nitrate yamanzi angaphantsi komhlaba kwimimandla enomhlaba wesanti. Uvavanyo lweKhomishini lukaJulayi 2026 luqinisekisile ukuba lo Mthetho “usabalulekile, ufanelekile kwaye usebenza” ukukhusela amanzi e-EU.

Ukuqaliswa kokusetyenziswa kwee-sensors ze-ISE ze-nitrate ze-Honde RS485 kwaqaliswa ngo-Epreli 2026 kwiindawo ezingama-25 zokubeka esweni kwiindawo zokukhusela amanzi angaphantsi komhlaba zaseGroningen naseDrenthe, eziqhutywa yinkampani yamanzi okusela iVitens.

Indlela iNethiwekhi Esebenza Ngayo Kwiindawo Zokubeka Iliso ezingama-25

Le mithombo ingama-25 isuka kwi-15 ukuya kwi-45 yeemitha ubunzulu, yonke ikwi-Pleistocene aquifers enesanti enokuqhuba okuphezulu kwe-hydraulic - oko kuthetha ukuba isabela ngokukhawuleza kwi-nitrate ethwalayo engaphezulu kwaye ibuyela kwimeko yayo yamva nje ngokukhawuleza xa umthombo we-nitrogen ususiwe. Impendulo ekhawulezileyo isebenza macala omabini: i-contain can spike ukusuka kwi-30 ukuya kwi-70 mg/L kwiintsuku ezintathu emva kwemvula enkulu, kwaye inokwehla iye kwi-35 mg/L ngeveki kamva xa i-pulse idlula. Isampuli yekota inokuphosa i-spike kunye ne-recovery, ixele i-42 mg/L ngokungathi akukho nto yenzekileyo.

I-sensor nganye ye-Honde nitrate ifakwa kwindawo evaliweyo yequla lokujonga, ixhonywe kwintambo yentsimbi engagqwaliyo kubunzulu apho amanzi angaphantsi komhlaba angena khona kwi-casing yomthombo. Intambo ye-RS485 ifikelela kwi-datalogger efakwe ngaphakathi kwe-wellhead evalekileyo. Kwi-18 kwi-25 wemithombo, i-datalogger iqhagamshela kwi-4G module ethumela ukufundwa kwe-nitrate yemizuzu eli-15 kwi-MQTT Json kwiqonga eliphakathi lamanzi leVitens. Kwi-7 wemithombo eseleyo - ekwiindawo zokugcina indalo ezikude apho kungekho zixhobo zeselula - i-module yiLoRaWAN, edlulisela idatha kwisango kwisikhululo sokumpompa esikufutshane, kwiikhilomitha ezisi-8 ukuya kwezili-14 ukusuka apho.

Kwintloko yomthombo, iData logger enesikrini ibonisa uxinaniso lwangoku lwe-nitrate, indlela eqhuba ngayo iiyure ezingama-24, kunye nembali yeentsuku ezingama-30. Ngexesha lokuhlolwa kokulinganiswa kwenyanga, ingcali yasentsimini isebenzisa iHandmeter ukuqinisekisa i-sensor efakiweyo ngokuchasene nesampulu yokubamba ehlalutyiweyo yelabhoratri eqokelelwe ngaxeshanye kwiqula elifanayo. Ukuba i-sensor ihambile ngaphaya kwe-±2 mg/L, iyatshintshwa kwindawo yayo ngaphantsi kwemizuzu engama-20 kwaye ihlengahlengiswe kwakhona kwilabhoratri ephakathi yeVitens.

I-Cloud server kunye nesoftware zidibanisa zonke ii-wells ezingama-25 zibe yideshibhodi enye. Umphathi wemisebenzi unokubona idatha yexesha langempela kunye nedatha yembali ye-wellfield yonke. Kodwa ideshibhodi ayisiyondlela iphambili yokhuseleko.

Inkqubo yokudlulisa i-Alarm. Iqula ngalinye linemida emibini ecwangcisiweyo. I-Threshold yokuqala, kwi-40 mg/L, ibangela isaziso sesilumkiso kwangethuba kwiqela elijongene nomgangatho wamanzi - uphawu lokuba iqula lisondela kumda osemthethweni we-50 mg/L kwaye linokufuna ukulungiswa komxube kwisityalo sonyango. I-Threshold yesibini, kwi-50 mg/L, ibangela i-relay ebonakalayo enokuyivala ngokuzenzekelayo ipompo yequla okanye isebenze enye iqula lokukhupha, iphambukise unikezelo ngaphambi kokuba amanzi angcolisiweyo afikelele kwindawo yokungenisa unyango.

Iziphumo zasentsimini: Iindawo zoKhuselo lwaManzi angaphantsi komhlaba eGroningen-Drenthe, ngo-Epreli-Julayi 2026

Iziphumo zokusebenza emva kweentsuku ezili-100:

• Izinzwa eziqhubekayo zifumanise ukujikeleza kwe-nitrate okungama-31 ngaphezulu kwama-50 mg/L okuwele ngokupheleleyo phakathi kwemihla yokuthathwa kwesampuli yekota. Ezi ziganeko zingama-31, ezimele inani elipheleleyo elimalunga neeyure ezili-1,800 zokuvezwa kwe-nitrate engaphezulu komda, bezingenakubonwa kwinkqubo yokuthathwa kwesampuli yekota ekhoyo.
• Kwimigodi emi-6, inkqubo yokudlulisa i-Alarm yabangela ukuvalwa kwepompo ngokuzenzekelayo xa i-nitrate idlula kwi-50 mg/L. Kwimigodi emi-6 nganye, uxinaniso lwe-nitrate lwaluhle ngaphantsi kwe-40 mg/L ngexesha isampuli yekota yayiza kuqokelelwa - oko kuthetha ukuba uhambo beluya kuba lungabhalwanga phantsi kolawulo lwangaphambili.
• Ukuchaneka kwe-ISE sensor, okuqinisekiswe ngokuchasene nohlalutyo lwelabhoratri lweesampuli zokubanjwa kwenyanga, kumyinge we-±1.8 mg/L kuzo zonke ii-sensors ezingama-25 kwixesha leentsuku ezili-100. I-sensor enye yaphuma ngaphandle kokunyamezelana kwe-±2 mg/L kwinyanga yesibini - ukushukuma kwafunyanwa ngokuqinisekiswa kweHandmeter yenyanga kwaye i-sensor yatshintshwa.
• Iqela leVitens elijongene nomgangatho wamanzi lisebenzise idatha yesilumkiso sakwangoko evela kumda we-40 mg/L ukulungisa kwangaphambili iireyithingi zokuxuba kwizityalo ezintathu zonyango, ukuthintela ukudlula okuqikelelweyo kwe-12 ngaphambi kokuba bafikelele kumda wokuvala we-50 mg/L.
• Ngokusekelwe kwidatha yovavanyo, iVitens icebise ukwandisa ukubekwa kweliso rhoqo kwe-nitrate ukuya kwimithombo yokubeka esweni engama-60 eyongezelelweyo kwiindawo zayo zokukhupha iGelderland ne-Overijssel ngo-2027.