{"id":1163,"date":"2024-04-11T14:18:42","date_gmt":"2024-04-11T11:18:42","guid":{"rendered":"https:\/\/sisu.ut.ee\/lcms_method_validation\/self-test-5-4a\/"},"modified":"2024-04-11T14:18:42","modified_gmt":"2024-04-11T11:18:42","slug":"self-test-5-4a","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/lcms_method_validation\/self-test-5-4a\/","title":{"rendered":"Self-test 5.4A"},"content":{"rendered":"<div id=\"watupro_quiz\" class=\"quiz-area single-page-quiz\">\n<p id=\"submittingExam10\" style=\"display:none;text-align:center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\"><\/p>\n\n\n\n<form action=\"\" method=\"post\" class=\"quiz-form\" id=\"quiz-10\" enctype=\"multipart\/form-data\">\n<div class=\"watu-question \" id=\"question-1\" style=\";\"><div id=\"questionWrap-1\" class=\"   watupro-question-id-30\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">1. <\/span>If blank matrix is not available for the analyst matrix effect can be estimated with:<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_1\" value=\"30\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType30\" class=\"answerTypeCnt1\" value=\"checkbox\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices30\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-30[]\" id=\"answer-id-101\" class=\"answer   answerof-30 \" value=\"101\"><label for=\"answer-id-101\" id=\"answer-label-101\" class=\" answer\"><span><p>Comparing peak areas for post-extraction spiked samples and standards with the same concentration.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-30[]\" id=\"answer-id-102\" class=\"answer   answerof-30 \" value=\"102\"><label for=\"answer-id-102\" id=\"answer-label-102\" class=\" answer\"><span><p>Comparing calibration graph slopes for post-extraction spiked samples and standards.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-30[]\" id=\"answer-id-103\" class=\"answer   answerof-30 \" value=\"103\"><label for=\"answer-id-103\" id=\"answer-label-103\" class=\" answer\"><span><p>Comparing calibration graph slopes for pre-extraction spiked samples and standards.<\/p><\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-1\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-30\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn30\" class=\"liveResultBtn1 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(30, 1);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-2\" style=\";\"><div id=\"questionWrap-2\" class=\"   watupro-question-id-31\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">2. <\/span>You are using a LC-MS (LC is reversed phase) and you observe severe matrix effect. How to remove or reduce matrix effect?<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_2\" value=\"31\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType31\" class=\"answerTypeCnt2\" value=\"checkbox\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices31\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-31[]\" id=\"answer-id-104\" class=\"answer   answerof-31 \" value=\"104\"><label for=\"answer-id-104\" id=\"answer-label-104\" class=\" answer\"><span><p>Add solid phase exctraction (C18) procedure for sample concentration to your sample preparation.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-31[]\" id=\"answer-id-105\" class=\"answer   answerof-31 \" value=\"105\"><label for=\"answer-id-105\" id=\"answer-label-105\" class=\" answer\"><span><p>Dilute the sample.<\/p><\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"checkbox\" name=\"answer-31[]\" id=\"answer-id-106\" class=\"answer   answerof-31 \" value=\"106\"><label for=\"answer-id-106\" id=\"answer-label-106\" class=\" answer\"><span><p>Inject smaller sample amount.<\/p><\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-2\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-31\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn31\" class=\"liveResultBtn2 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(31, 2);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-3\" style=\";\"><div id=\"questionWrap-3\" class=\"   watupro-question-id-32\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">3. <\/span>Process efficiency\u00a0expresses the efficiency of the sample preparation step.<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_3\" value=\"32\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType32\" class=\"answerTypeCnt3\" value=\"radio\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices32\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-32[]\" id=\"answer-id-107\" class=\"answer   answerof-32 \" value=\"107\"><label for=\"answer-id-107\" id=\"answer-label-107\" class=\" answer\"><span>True<\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-32[]\" id=\"answer-id-108\" class=\"answer   answerof-32 \" value=\"108\"><label for=\"answer-id-108\" id=\"answer-label-108\" class=\" answer\"><span>False<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-3\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-32\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn32\" class=\"liveResultBtn3 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(32, 3);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-4\" style=\";\"><div id=\"questionWrap-4\" class=\"   watupro-question-id-33\">\n\t\t\t<div class=\"question-content\"><div><span class=\"watupro_num\">4. <\/span>Process efficiency refers to the joint effect of possible losses during sample preparation and ionization suppression\/enhancement in the ion source.<\/div><input type=\"hidden\" name=\"question_id[]\" id=\"qID_4\" value=\"33\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType33\" class=\"answerTypeCnt4\" value=\"radio\"><!-- end question-content--><\/div><div class=\"question-choices watupro-choices-columns \" id=\"questionChoices33\"><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-33[]\" id=\"answer-id-109\" class=\"answer   answerof-33 \" value=\"109\"><label for=\"answer-id-109\" id=\"answer-label-109\" class=\" answer\"><span>True<\/span><\/label><\/div><div class=\"watupro-question-choice  \" dir=\"auto\"><input type=\"radio\" name=\"answer-33[]\" id=\"answer-id-110\" class=\"answer   answerof-33 \" value=\"110\"><label for=\"answer-id-110\" id=\"answer-label-110\" class=\" answer\"><span>False<\/span><\/label><\/div><!-- end question-choices--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-4\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-33\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn33\" class=\"liveResultBtn4 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(33, 4);\"><\/p>\n\t   <div class=\"watu-question \" id=\"question-5\" style=\";\"><div id=\"questionWrap-5\" class=\"   watupro-question-id-165\">\n\t\t\t<div class=\"question-content\"><p><span class=\"watupro_num\">5. <\/span>Please rate the options for counting the matrix effect:<\/p>\n<p>Structurally similar internal standard\u00a0 \u00a0 <select name=\"gap_165_1\" class=\"watupro-gap answer answerof-165\"><option value=\"\"><\/option><option value=\"Can be used but is not the best\">Can be used but is not the best<\/option><option value=\"The worst\">The worst<\/option><option value=\"The best\">The best<\/option><\/select><br>\nStandard addition\u00a0 \u00a0 <select name=\"gap_165_2\" class=\"watupro-gap answer answerof-165\"><option value=\"\"><\/option><option value=\"Can be used but is not the best\">Can be used but is not the best<\/option><option value=\"The worst\">The worst<\/option><option value=\"The best\">The best<\/option><\/select><br>\nMatrix matched calibration\u00a0 <select name=\"gap_165_3\" class=\"watupro-gap answer answerof-165\"><option value=\"\"><\/option><option value=\"The best\">The best<\/option><option value=\"Can be used but is not the best\">Can be used but is not the best<\/option><option value=\"The worst\">The worst<\/option><\/select><br>\nIsotope dilution\u00a0 <select name=\"gap_165_4\" class=\"watupro-gap answer answerof-165\"><option value=\"\"><\/option><option value=\"The best\">The best<\/option><option value=\"Can be used but is not the best\">Can be used but is not the best<\/option><option value=\"The worst\">The worst<\/option><\/select><\/p>\n<input type=\"hidden\" name=\"question_id[]\" id=\"qID_5\" value=\"165\" class=\"watupro-question-id\"><input type=\"hidden\" id=\"answerType165\" class=\"answerTypeCnt5\" value=\"gaps\"><!-- end question-content--><\/div><!-- end questionWrap--><\/div>\t\t\t\t\t<div style=\"display:none;\" id=\"liveResult-5\">\t\t   \n\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t\t\t\t\t<\/div>\t\n\t\t\t<\/div> \n\t   \t<p id=\"liveResBtn-165\" style=\"clear:both;\"><input type=\"button\" id=\"liveResultBtn165\" class=\"liveResultBtn5 watupro-live-result-btn\" value=\"See Answer\" onclick=\"WatuPRO.liveResult(165, 5);\"><\/p>\n\t   <div style=\"display:none\" id=\"question-6\">\n\t<div class=\"question-content\">\n\t\t<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sisu.ut.ee\/wp-content\/plugins\/watupro\/img\/loading.gif\" width=\"16\" height=\"16\" alt=\"Loading...\" title=\"Loading...\">\u00a0Loading...\t<\/div>\n<\/div>\n\n<br>\n\t\n\t\t\t<div class=\"watupro_buttons flex \" id=\"watuPROButtons10\">\n\t\t  <div id=\"prev-question\" style=\"display:none;\"><input type=\"button\" value=\"&lt; Previous\" onclick=\"WatuPRO.nextQuestion(event, 'previous');\"><\/div>\t\t  \t\t  \t\t   \n\t\t   \t  \t\t<div><input type=\"button\" name=\"action\" class=\"watupro-submit-button\" onclick=\"WatuPRO.submitResult(event)\" id=\"action-button\" value=\"View Results\">\n\t\t<\/div>\n\t\t<\/div>\n\t\t\n\t<input type=\"hidden\" name=\"quiz_id\" value=\"10\" id=\"watuPROExamID\">\n\t<input type=\"hidden\" name=\"start_time\" id=\"startTime\" value=\"2026-04-17 19:23:38\">\n\t<input type=\"hidden\" name=\"start_timestamp\" id=\"startTimeStamp\" 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