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meatpollutant牛羊肉罐头污染物超标判定

v1.0.1

依据GB 5009.5-2025第一法凯氏定氮法，指导畜禽肉蛋白质含量测定全流程，涵盖试剂配制、消解蒸馏、滴定操作及结果计算；当用户需要检测肉类蛋白质、执行凯氏定氮实验、计算蛋白质含量或验证精密度时使用

⭐ 0· 63·0 current·0 all-time
byTinker@cloudyxuq

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Prompt PreviewInstall & Setup
Install the skill "meatpollutant牛羊肉罐头污染物超标判定" (cloudyxuq/meat-pollutant-check) from ClawHub.
Skill page: https://clawhub.ai/cloudyxuq/meat-pollutant-check
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openclaw skills install meat-pollutant-check

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npx clawhub@latest install meat-pollutant-check
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Purpose & Capability
The repository metadata and slug (meat-pollutant-check; displayed Name: 'meatpollutant牛羊肉罐头污染物超标判定') imply pollutant/contaminant over-limit checking for canned beef/lamb, but the SKILL.md, reference doc, and included script implement a Kjeldahl protein (nitrogen) determination workflow. There is no code or instructions related to pollutant detection. This inconsistency between advertised purpose and actual capability is a notable incoherence.
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Instruction Scope
SKILL.md provides detailed, tightly scoped lab instructions for sample prep, digestion, distillation/titration, and calls the bundled calculation script. It references only local files in the bundle (references/kjeldahl-procedure.md and scripts/calculate_protein.py). There are no instructions to read unrelated system files, environment variables, or to transmit data externally. Note: the instructions describe hazardous chemical procedures — they are appropriate for a laboratory context but pose safety risks if followed outside a properly equipped lab.
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Install Mechanism
No install spec and no external downloads; this is instruction-plus-a-small-script only. The script is included in the bundle and there is no installer that would write or execute external code beyond running the provided Python script locally.
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Credentials
The skill requests no environment variables, credentials, or config paths. The calculation script runs locally with user-supplied numerical parameters and does not attempt to access external services or secrets.
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Persistence & Privilege
always is false and there is no install-time behavior that modifies other skills or system-wide settings. The skill can be invoked by the agent (default), which is normal; this combined with no credentials or external endpoints keeps privilege scope minimal.
What to consider before installing
Key points before installing: 1) The skill appears mislabeled — although the name/slug suggests a pollutant over-limit checker, the content implements a Kjeldahl protein measurement workflow (protein calculation script + lab procedure). If you expected contaminant testing, this skill does not provide it. 2) The code and docs are local and contain no network calls or credential requests, so direct data-exfiltration risk is low. 3) The SKILL.md contains hazardous chemistry procedures (strong acids, high-temperature digestion); only follow these instructions in an appropriate laboratory with proper training and PPE. 4) If you will use the calculation script, review the formula and test with known values to confirm it meets your lab's validation requirements. 5) If the mismatch between advertised purpose and actual content is unacceptable, do not install; contact the skill publisher (if available) or prefer a clearly labeled skill that matches your use-case.

Like a lobster shell, security has layers — review code before you run it.

latestvk97d4a1jd6mf9df4ypb4h1sbc184ydpd
63downloads
0stars
2versions
Updated 1w ago
v1.0.1
MIT-0
Tinker@cloudyxuq
latest
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畜禽肉蛋白质凯氏定氮法测定

任务目标

  • 本 Skill 用于：依据 GB 5009.5-2025 第一法凯氏定氮法，指导畜禽肉中蛋白质含量的测定
  • 能力包含：检测流程指导、试剂配制方案、结果计算与精密度验证
  • 触发条件：用户需要检测畜禽肉蛋白质含量、执行凯氏定氮实验、计算或验证检测结果

前置准备

  • 本方法依据：GB 5009.5-2025《食品安全国家标准 食品中蛋白质的测定》第一法
  • 适用范围：畜禽肉类及其制品中蛋白质含量的测定
  • 畜禽肉蛋白质折算系数：F = 6.25

操作步骤

步骤 1：试样制备

  • 畜禽肉属于基质均匀的半固态样品，直接称量即可
  • 制备好的试样应尽快测定
  • 如结果需以干基计算，按 GB 5009.3 测定水分含量

步骤 2：试剂与设备确认

  • 读取 references/kjeldahl-procedure.md 中"试剂配制"与"仪器设备"章节
  • 确认所有试剂在有效期内，标准滴定溶液已标定
  • 关键试剂：硫酸铜(CuSO4-5H2O)、硫酸钾(K2SO4)、硫酸(>=98%)、氢氧化钠、硼酸、混合指示液

步骤 3：试样消解

  • 称取固体试样 0.2 g~2 g（精确至 0.001 g），移入干燥的定氮瓶中
  • 加入 0.4 g 硫酸铜、6 g 硫酸钾及 20 mL 硫酸
  • 轻摇后于瓶口放一小漏斗，将瓶以 45 度角斜置于有小孔的石棉网上
  • 缓慢加热，待内容物全部碳化、泡沫完全停止后，加大火力
  • 保持瓶内液体微沸，至液体呈蓝绿色并澄清透明后，再继续加热 0.5 h~1 h
  • 取下定氮瓶冷却至室温，小心加入 20 mL 水
  • 将内容物全部转移至 100 mL 容量瓶中，洗涤定氮瓶内壁，洗液并入容量瓶，加水至刻度，混匀备用
  • 同时进行空白试验

消解注意事项详见 references/kjeldahl-procedure.md 中"消解操作要点"

步骤 4：蒸馏与滴定

  • 按定氮蒸馏装置装好设备，向水蒸气发生器内装水至 2/3 处
  • 加入数粒玻璃珠、甲基红数滴及数毫升硫酸，保持水呈酸性
  • 向接收瓶内加入 10.0 mL 硼酸溶液及 3~4 滴混合指示剂（A 或 B）
  • 使冷凝管下端插入液面下，准确吸取 2.0 mL~10.0 mL 试样处理液注入反应室
  • 加入 10.0 mL 氢氧化钠溶液，立即密封并水封，开始蒸馏
  • 蒸馏 15 min 后使接收瓶液面离开冷凝管下端，再蒸馏约 1 min
  • 用 pH 试纸检测馏出液为中性后，用少量水冲洗冷凝管下端
  • 以硫酸或盐酸标准滴定溶液滴定至终点

滴定终点判断：A 混合指示液终点为紫红色；B 混合指示液终点为浅灰红色

步骤 5：结果计算

  • 调用 scripts/calculate_protein.py 计算蛋白质含量
  • 脚本参数说明：
    • --v1：试液消耗标准滴定液体积（mL）
    • --v2：试剂空白消耗标准滴定液体积（mL）
    • --c：标准滴定溶液浓度（mol/L）
    • --m：试样质量（g）
    • --v3：吸取消化液体积（mL）
    • --v4：消解溶液定容体积（mL）
    • --F：蛋白质折算系数，畜禽肉默认 6.25
    • --moisture：水分含量百分比（可选，用于干基计算）
  • 示例命令： 
    python scripts/calculate_protein.py --v1 2.50 --v2 0.20 --c 0.1005 --m 1.002 --v3 10.0 --v4 100 --F 6.25

步骤 6：精密度验证

  • 当进行两次平行测定时，使用脚本的 --precision 参数验证精密度
  • 精密度要求：
    • 蛋白质含量 <= 10 g/100g：两次结果绝对差值不超过算术平均值的 10%
    • 蛋白质含量 > 10 g/100g：两次结果绝对差值不超过算术平均值的 5%
  • 示例命令： 
    python scripts/calculate_protein.py --v1 2.50 --v2 0.20 --c 0.1005 --m 1.002 --v3 10.0 --v4 100 --F 6.25 --precision --v1_2 2.60 --v2_2 0.20 --c2 0.1005 --m2 1.005 --v3_2 10.0 --v4_2 100

步骤 7：全自动/半自动凯氏定氮仪法（可选）

  • 使用消化炉消解，当消化炉温度达到 420 度后继续消化至少 1 h
  • 消化管中液体呈绿色透明状后，于全自动/半自动凯氏定氮仪检测
  • 蛋白质含量 <= 1 g/100g 时建议用 0.05 mol/L 标准滴定液
  • 蛋白质含量 > 1 g/100g 时建议用 0.10 mol/L 标准滴定液
  • 使用全自动仪器时 V3 = V4（全部转移消化液）

资源索引

注意事项

  • 消解过程必须全程在通风橱中进行，防止酸雾伤害
  • 硫酸具有强腐蚀性，操作时佩戴防护手套和护目镜
  • 空白试验与样品试验必须同步进行，使用同一批试剂
  • 标准滴定溶液需按 GB/T 601 配制和标定，或使用有证标准物质
  • 蛋白质含量 >= 1 g/100g 时结果保留三位有效数字；< 1 g/100g 时保留两位有效数字
  • 分析结果以蛋白质含量表述时，应同时报告蛋白质折算系数
  • 食品中若添加非蛋白质含氮物质，将影响蛋白质测定结果的准确性

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